Former leaders at the Department of Homeland Security, including then-Homeland Security Secretary Kirstjen Nielsen Kirstjen Michele NielsenMore than million in DHS contracts awarded to firm of acting secretary's wife: report DHS IG won't investigate after watchdog said Wolf, Cuccinelli appointments violated law Appeals court sides with Trump over drawdown of immigrant protections MORE, pushed back on a White House plan for mass arrests of migrants shortly before their ouster, according to The Washington Post.

The Trump administration had planned to arrest thousands of parents and children in 10 major U.S. cities to deter further migrants, the Post reported, citing seven current and former DHS officials. The plan involved fast-tracking immigration court cases and expanding the government’s authority to deport migrants who did not show for their hearings. Arrests of the no-shows would involve coordinated raids of the homes and neighborhoods of parents with children, according to the Post.

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Nielsen and then-acting Director of Immigration and Customs Enforcement (ICE) Ronald Vitiello put a stop to the plan, citing lack of preparation by ICE personnel and public relations concerns, according to the Post.

“There was concern that it was being hastily put together, would be ineffective, and might actually backfire by misdirecting resources away from critical border emergency response operations,” one DHS official told the Post.

Major boosters of the plan within the administration included senior Trump adviser Stephen Miller Stephen MillerSpecial counsel investigating DeVos for potential Hatch Act violation: report Trump confirms another White House staffer tested positive for COVID-19 Biden pick creates furor, underscoring bitterness over Obama immigration policy MORE and Immigration and Customs Enforcement Deputy Director Matthew Albence. The plan, which is reportedly still under consideration, incorporated cities including New York, Chicago and Los Angeles, according to the Post.

The two officials' pushback was a major factor in their ouster, according to the Post, citing administration officials. When Trump announced the withdrawal of Vitiello's nomination as ICE director in April, he expressed a desire to go in a "tougher" direction without further elaborating.

“Both he and Nielsen instinctively thought it was bad policy and that the proposal was less than half-baked,” a DHS official told the Post.

The White House did not immediately respond to a request for comment from The Hill.