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

White House senior adviser Stephen MillerStephen MillerThe Memo: Drip, drip of revelations damages Trump Trump says acting Homeland Security chief McAleenan will step down Overnight Health Care — Presented by Coalition Against Surprise Medical Billing — Judge blocks Trump 'public charge' rule | Appeals court skeptical of Trump arguments for Medicaid work requirements | CDC offers guidance for treating vaping-related cases 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 he doesn't want NYT in the White House Veterans group backs lawsuits to halt Trump's use of military funding for border wall Schiff punches back after GOP censure resolution fails 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 MulvaneyTrump urges GOP to fight for him Bill Press: Mulvaney proves need for daily briefings Gingrich calls for eliminating White House press corps in wake of Mulvaney briefing 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's top picks for Homeland Security chief are ineligible for job: reports Singer Brandi Carlile drops out of Fortune event over Kirstjen Nielsen's appearance Trump confirms Rick Perry to step down as Energy secretary 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.