Donald Trump says Kevin McAleenan is out at Homeland Security

4th Homeland Security secretary steps down under President Trump

4th Homeland Security secretary steps down under President Trump

Acting Homeland Security Secretary Kevin McAleenan is leaving his post, the latest casualty at the department responsible for protecting US borders.

In the President's tweet, he said McAleenan is leaving his position to "spend more time with and family" and work in the "private sector".

"Congratulations Kevin, on a job well done!"

"With his [Trump's] support, over the last six months we have made tremendous progress mitigating the border security and humanitarian crisis we faced this year, by reducing unlawful crossings, partnering with governments in the region to counter human smugglers and [addressing] the causes of migration, and [deploying] additional border security resources", he said.

In fact, McAleenan's star had waned considerably within Trump's orbit of late.

President Trump tours a section of the southern border wall, in Otay Mesa, Calif., with acting Homeland Secretary Kevin McAleenan on September 18, 2019.Trump announced October 11, 2019, that McAleenan is stepping down.

Homeland Security has been the cabinet post with the highest turnover in the Trump administration at this point.

As Peter Baker of the New York Times notes, McAleenan's resignation means that his replacement will be President Trump's "fourth homeland security secretary in less than three years".

McAleenan was successful in sharply curbing border crossings, which had bedeviled his predecessors and had led to the departure of Kirstjen Nielsen, who had the job before McAleenan.

A person close to McAleenan said he resigned on Friday after weeks of growing disenchantment with his standing in the administration.