Homeland Security chief Kirstjen Nielsen steps down.

President Trump visits a new section of the border wall with
Mexico in Calexico, Calif., on Friday.
(AP Photo/Jacquelyn Martin)

As the Trump administration wrestles with what it calls a “crisis” of immigration from Central America, Kirstjen Nielsen resigned Sunday as head of the Department of Homeland Security, which includes the agencies charged with enforcing the nation’s border and immigration laws.

President Trump announced the move on Twitter.

“I would like to thank her for her service,” Trump tweeted, adding that current Customs and Border Protection Commissioner, Kevin McAleenan, would step in as acting DHS Secretary.

By Caitlin Dickson.

Full story at Yahoo News.