Acting DHS secretary threatened to quit after clashing with Miller: report

White House senior adviser Stephen MillerStephen MillerConservatives slam Warren's call to put transgender women in women's prisons Immigrants are an economic boon to America Giuliani's unofficial role allowed him to avoid White House disclosure rules: report MORE’s attempt to engineer a second shake-up at the Department of Homeland Security (DHS) was blocked this week by acting Secretary Kevin McAleenan, who later threatened to resign unless he was given more control over the agency.

Administration officials told The Washington Post that the closed-door clash revolved around Mark Morgan, a former FBI agent who is President TrumpDonald John TrumpTrump says his advice to impeachment defense team is 'just be honest' Trump expands tariffs on steel and aluminum imports CNN's Axelrod says impeachment didn't come up until 80 minutes into focus group MORE’s pick to be the new director of U.S. Immigration and Customs Enforcement (ICE).

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Miller Wednesday reportedly urged the president to put Morgan atop U.S. Customs and Border Protection (CBP) instead.

McAleenan told acting White House chief of staff Mick MulvaneyJohn (Mick) Michael MulvaneySenate Republicans must stand up for the rule of law and ensure a fair, open proceeding Democrats cap impeachment arguments with focus on Trump stonewalling Lindsey Graham will oppose subpoena of Hunter Biden MORE and others the next day that he was in charge of the department and would make or should at least be involved in DHS personnel decisions.

The DHS acting secretary prevailed and ensured Morgan will take his role atop ICE as planned. Matthew Albence, the current acting director whom Miller wanted to lead ICE, will return to his job as deputy director.

“This was a power struggle between McAleenan and Miller, and McAleenan won,” one senior official with knowledge of the situation told the Post.

The White House told the Post that McAleenan and Miller have since resolved some of their differences.

The White House and DHS did not immediately respond to requests for comment from The Hill.

An escalating immigration crisis has put increased pressure on Trump to make good on his campaign promise to tackle ongoing issues at the border and ramp up scrutiny of DHS efforts to curtail the flow of migrants in the U.S. 

Miller engineered a shake-up at DHS last month that led to the ouster of Secretary Kirstjen NielsenKirstjen Michele NielsenActing DHS secretary says he expects Russia to attempt to interfere in 2020 elections House Homeland Security rip DHS's 'unacceptable' failure to comply with subpoena Trump puts Kushner in charge of overseeing border wall construction: report MORE and the previous acting ICE director, Ronald Vitiello, among others. Miller, a well-known immigration hawk, reportedly urged Trump to form a team that will more aggressively execute his policies at the border.

Nielsen and Vitiello before the shake-up had reportedly challenged a plan by Miller to carry out mass arrests of women and children eligible for deportation in 10 cities.

Officials told the Post that Miller told colleagues he would support McAleenan following his nomination.