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

White House senior adviser Stephen MillerStephen MillerTrump administration releases new 'public charge' rule making it easier to reject immigrants Assistant secretary of State resigns after immigration clash: report Top US diplomat for Latin America resigns 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 TrumpWarren unveils Native American policy plan Live-action 'Mulan' star spurs calls for boycott with support of Hong Kong police Don't let other countries unfairly tax America's most innovative companies 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 MulvaneyThe Hill's Morning Report - How will Trump be received in Dayton and El Paso? Democratic lawmaker criticized for tweeting names of Trump donors Ocasio-Cortez: Trump's immigration rhetoric 'directly responsible' for El Paso mass shooting 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 NielsenTrump casts uncertainty over top intelligence role Juan Williams: Trump, his allies and the betrayal of America Trump taps Texas Rep. Ratcliffe to replace Dan Coats as top intelligence official 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.