WASHINGTON — President Trump often alluded to John F. Kelly as one of "my commanders," the three senior military pioneers he selected for his group. On Friday, Mr. Trump chose to see whether Mr. Kelly, a resigned four-star Marine Corps general, could force another feeling of train on a rowdy and turbulent West Wing. 

Mr. Kelly, who turned into a star in Mr. Trump's eyes for administering migration approach as secretary of country security, will turn into the president's second head of staff. He replaces Reince Priebus, the foundation Republican who never totally fit with Mr. Trump. Mr. Priebus was expelled after a dreadful open fight with Anthony Scaramucci, the new White House interchanges executive. 

The square-jawed Mr. Kelly, the main general to hold the head of staff position since Alexander M. Haig amid the Nixon organization, will be a forcing and strait-bound figure in a West Wing loaded with always warring assistants and guides, the vast majority of whom came to Washington with for all intents and purposes no involvement in government before Mr. Trump's triumph a year ago. 

"John has likewise made an astounding showing with regards to with Homeland Security," Mr. Trump composed on Twitter, calling Mr. Kelly an "incredible American" and saying he had been a "genuine star of my Administration." 

Mr. Kelly's landing in his new post on Monday could flag another steadiness at the White House, however just if Mr. Trump gives him the specialist to get serious about the conduct of his different assistants. As a land engineer, Mr. Trump has worked with a staff that has regularly appeared to be wild. 

The determination of Mr. Kelly was immediately adulated by the two Republicans and Democrats, who communicated trust that he would convey a quick end to the diverting fights among the president's staff. 

"The sort of teach that he will bring is vital," Senator Richard Blumenthal, Democrat of Connecticut, said on CNN soon after the president's declaration. "I trust that we're at a defining moment now." 

Mr. Kelly had no past association with Mr. Trump until the point that he was assigned to join his organization, however he has since quite a while ago sustained bipartisan help from individuals from Congress. Also, he was not generally in bolt venture with Mr. Trump's arrangements, openly scrutinizing the requirement for a full fringe divider with Mexico and calling Russia a risk to the United States as the president flagged a friendlier way to deal with Moscow. 

However, finished the a half year of his residency driving the Department of Homeland Security, Mr. Kelly, whom companions portray as unafraid to challenge his bosses, developed as an essential and very unmistakable surrogate for the president. 

He took a hard line against unlawful migration and swam into the Russia decision impedance debate by guarding Jared Kushner, Mr. Trump's child in-law and senior guide, who attempted to open back channel correspondences with the Kremlin. Mr. Kelly said it was "no major ordeal." 

For Mr. Trump, the choice to put Mr. Kelly in control at the White House mirrored a profound yearning for somebody who can extend the sort of quality and conclusiveness that the president never observed amid the a half year that Mr. Priebus possessed the corner office down the corridor from the Oval Office. 

Mr. Priebus once in a while showed the sort of best down control over the president's staff that is regular in a White House, where the head of staff frequently applies strict control over the president's chance, the organization's plan and general society message originating from the interchanges office. 

Mr. Kelly, who ran the military's operations in Central America, South America and the Caribbean, has the sort of experience that Mr. Trump regards: a chest loaded with decorations verifying his valor and achievements. 

Be that as it may, Mr. Kelly is likewise a veteran of the political wars in Washington, where he has manufactured longstan