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

White House senior adviser Stephen MillerStephen MillerTop Democrats question legal basis for appointing Cuccinelli as temporary immigration chief Five memorable moments from Sarah Sanders at the White House Trump taps former ICE director to return as 'border czar' 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 TrumpNew EPA rule would expand Trump officials' powers to reject FOIA requests Democratic senator introduces bill to ban gun silencers Democrats: Ex-Commerce aide said Ross asked him to examine adding census citizenship question 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 MulvaneyOn The Money: Sanders unveils plan to wipe .6T in student debt | How Sanders plan plays in rivalry with Warren | Treasury watchdog to probe delay of Harriet Tubman bills | Trump says Fed 'blew it' on rate decision The Hill's 12:30 Report: Trump targets Iran with new sanctions Top Democrat accuses White House of obstructing review related to Trump-Putin communications 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 NielsenElection security bills face GOP buzzsaw Five memorable moments from Sarah Sanders at the White House Trump admin program sends asylum-seekers to await claims in Mexico, despite fears of violence: 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.