WASHINGTON — The whirlwind first week of Donald J. Trump’s presidency had all the bravura hallmarks of a Stephen K. Bannon production.

It started with the doom-hued inauguration homily to “American carnage” in United States cities co-written by Mr. Bannon, followed a few days later by his “shut up” message to the news media. The week culminated with a blizzard of executive orders, mostly hatched by Mr. Bannon’s team and the White House policy adviser, Stephen Miller, aimed at disorienting the “enemy,” fulfilling campaign promises and distracting attention from Mr. Trump’s less than flawless debut.

But the defining moment for Mr. Bannon came Saturday night in the form of an executive order giving the rumpled right-wing agitator a full seat on the “principals committee” of the National Security Council — while downgrading the roles of the chairman of the Joint Chiefs of Staff and the director of national intelligence, who will now attend only when the council is considering issues in their direct areas of responsibilities. It is a startling elevation of a political adviser, to a status alongside the secretaries of state and defense, and over the president’s top military and intelligence advisers.

In theory, the move put Mr. Bannon, a former Navy surface warfare officer, admiral’s aide, investment banker, Hollywood producer and Breitbart News firebrand, on the same level as his friend, Michael T. Flynn, the national security adviser, a former Pentagon intelligence chief who was Mr. Trump’s top adviser on national security issues before a series of missteps reduced his influence.

But in terms of real influence, Mr. Bannon looms above almost everyone except the president’s son-in-law, Jared Kushner, in the Trumpian pecking order, according to interviews with two dozen Trump insiders and current and former national security officials. The move involving Mr. Bannon, as well as the boost in status to the White House homeland security adviser, Thomas P. Bossert, and Mr. Trump’s relationships with cabinet appointees like Defense Secretary Jim Mattis, have essentially layered over Mr. Flynn.

Sean Spicer, the White House press secretary, said Mr. Bannon — whose Breitbart website was a magnet for white nationalists, antiglobalists and conspiracy theorists — always planned to participate in national security. Mr. Flynn welcomed his participation, Mr. Spicer said, but the general “led the reorganization of the N.S.C.” in order to streamline an antiquated and bloated bureaucracy.

Former White House officials in both parties were shocked by the move.

“The last place you want to put somebody who worries about politics is in a room where they’re talking about national security,” said Leon E. Panetta, a former White House chief of staff, defense secretary and C.I.A. director in two Democratic administrations.

“I’ve never seen that happen, and it shouldn’t happen. It’s not like he has broad experience in foreign policy and national security issues. He doesn’t. His primary role is to control or guide the president’s conscience based on his campaign promises. That’s not what the National Security Council is supposed to be about.”

That opinion was shared by President George W. Bush’s last chief of staff, Josh Bolten, who barred Karl Rove, Mr. Bush’s political adviser, from N.S.C. meetings. A president’s decisions made with those advisers, he told a conference audience in September, “involve life and death for the people in uniform” and should “not be tainted by any political decisions.”

Susan E. Rice, President Barack Obama’s last national security adviser, called the arrangement “stone cold crazy” in a tweet posted Sunday.

Mr. Spicer said the language the Trump White House used in its N.S.C. executive order is, with the exception of Mr. Bannon’s position — which was created during the transition — almost identical in content to one the Bush administration drafted in 2001. And Mr. Obama’s top political operative, David Axelrod, sat in on some N.S.C. meetings, he added.

There were key differences. Mr. Axelrod never served as a permanent member as Mr. Bannon will now, though he sat in on some critical meetings, especially as Mr. Obama debated strategy in Afghanistan and Pakistan. “It’s a profound shift,” Mr. Axelrod said. “I don’t know what his bona fides are to be the principal foreign policy adviser to the president.”

But Mr. Bannon’s elevation does not merely reflect his growing influence on national security. It is emblematic of Mr. Trump’s trust on a range of political and ideological issues.

During the campaign, the sly and provocative Mr. Bannon played a paradoxical role — calming the easily agitated candidate during his frequent rough patches and egging him on when he felt Mr. Trump needed to fire up the white working-class base. The president respects Mr. Bannon because he is independently wealthy and therefore does not need the job, and both men ascribe to a shoot-the-prisoners credo when put on the defensive, according to the former Trump campaign manager Corey Lewandowski.

Mr. Bannon is a deft operator within the White House, and he has been praised by Republicans who view him skeptically as the most knowledgeable on policy around the president. But his stated preference for blowing things up — as opposed to putting them back together — may not translate to his new role.

The hasty drafting of the immigration order, and its scattershot execution, brought a measure of Mr. Bannon’s chaotic and hyperaggressive political style to the more predictable administration of the federal government. Within hours of the edict, airport customs and border agents were detaining or blocking dozens of migrant families, some of whom had permanent resident status, until John F. Kelly, the new homeland security secretary, intervened.

Mr. Kelly’s department had suggested green card holders be exempted from the order, but Mr. Bannon and Mr. Miller, a hard-liner on immigration, overruled him, according to two American officials.

Mr. Priebus, speaking on NBC’s “Meet the Press” on Sunday, indicated a softening of the stance, saying the order would not block “green card holders moving forward” — but said anyone seeking to enter the country from the listed countries would be subjected to tighter scrutiny.

People close to Mr. Bannon said he is not accumulating power for power’s sake, but is instead helping to fill a staff leadership vacuum created, in part, by Mr. Flynn’s stumbling performance as national security adviser.

Mr. Flynn still communicates with Mr. Trump frequently, and his staff has been assembling a version of the Presidential Daily Briefing for Mr. Trump, truncated but comprehensive, to be the president’s main source of national security information. During the campaign, he often had unfettered access to the candidate, who appreciated his brash style and contempt for Hillary Clinton, but during the transition, Mr. Flynn privately complained about having to share face time with others.

Mr. Flynn “has the full confidence of the president and his team,” Hope Hicks, a spokeswoman for Mr. Trump, said in an email. Emails and phone calls to Mr. Flynn and his top aide were not returned.

A president who likes generals and abhors political correctness, Mr. Trump found in Mr. Flynn — who joined Trump backers in an anti-Clinton “lock her up!” chant during the campaign — perhaps the most politically incorrect general this side of his hero, Gen. George S. Patton.

But Mr. Flynn, a lifelong Democrat sacked as head of the Pentagon’s intelligence arm after clashing with Obama administration officials in 2014, has gotten on the nerves of Mr. Trump and other administration officials because of his sometimes overbearing demeanor, and has further diminished his internal standing by presiding over a chaotic and opaque N.S.C. transition process that prioritized the hiring of military officials over civilian experts recommended to him by his own team.

Mr. Flynn’s penchant for talking too much was on display on Friday in a meeting with Theresa May, the British prime minister, according to two people with direct knowledge of the events.

When Mrs. May said that she understood wanting a dialogue with Mr. Putin but stressed the need to be careful, Mr. Trump asked Mr. Flynn when the two were scheduled to speak.

Mr. Flynn replied it was Saturday — he had delayed it to fit in Mrs. May’s meeting for “protocol” as a United States ally, adding at length that Mr. Putin was impatient to chat.

Mr. Trump, the person said, appeared irritated by the response.

Still, the episode that did the most damage to the Trump-Flynn relationship occurred in early December when Mr. Flynn’s son, also named Michael, unleashed a series of tweets pushing a discredited conspiracy theory that Clinton associates had run a child sex-slave ring out of a Washington pizza restaurant.

Mr. Trump told his staff to get rid of the younger Mr. Flynn, who had been hired by his father to help during the transition. But Mr. Trump did so reluctantly because of his loyalty during the campaign, when dozens of former military officials were dismissing Mr. Trump as too unstable to command.

“I want him fired immediately,” Mr. Trump said in a muted rendition of his “You’re fired!” line in “The Apprentice,” according to two people with knowledge of the interaction.

That has not stopped the general’s son from spouting off: On Saturday, at a time when Trump surrogates were pushing back on the idea that the executive order did not discriminate against any religion, the younger Mr. Flynn tweeted his approval of the policy, adding “#MuslimBan.” The tweet was subsequently deleted; his entire account disappeared later in the day.

Still, the national security adviser has also continued to dabble in the kind of bomb-throwing behavior that concerns Mr. Trump’s allies, such as planning to attend an anti-Clinton “Deploraball” event at the time of the inauguration. He was urged to skip it by Trump allies, and ultimately agreed.

Both Mr. Trump and Mr. Bannon still regard Mr. Flynn as an asset. “In the room and out of the room, Steve Bannon is General Flynn’s biggest defender,” said Kellyanne Conway, another top adviser to the president.

But it is unclear when the maneuvers to reduce Mr. Flynn’s role began. Two Obama administration officials said Trump transition officials inquired about expanded national security roles for Mr. Bannon and Mr. Kushner at the earliest stages of the transition in November — before the younger Mr. Flynn became a liability — but after Mr. Flynn had begun to chafe on the nerves of his colleagues on the team.

Mr. Flynn’s reputation has raised questions among some in the cabinet. Two weeks ago, both men held a meeting with Rex W. Tillerson, Mr. Trump’s pick to run the State Department, Mr. Mattis and Mike Pompeo, now the C.I.A. director, to discuss coordination — Mr. Flynn was invited but did not attend.

Part of the meeting was devoted to discussing concerns about Mr. Flynn, according to an official with knowledge of it.

Credit:https://www.nytimes.com/2017/01/29/us/stephen-bannon-donald-trump-national-security-council.html?nytmobile=0&_r=0