“I am saddened to take this step, as it was my intention to serve the Department until the end of this Administration,” he wrote in a letter to colleagues.
The move comes after a judge ordered DHS to accept new applicants for the Obama-era program that protects young immigrants, or "Dreamers," from deportation.
A judge found that Acting Department of Homeland Security Secretary Chad Wolf assumed his position unlawfully.
Acting Homeland Security Secretary Chad Wolf allegedly sought to suppress intelligence information that would make President Trump look bad.
Agency officials reportedly sat on the bulletin after acting DHS Secretary Chad Wolfe asked questions about it.
The video raised concerns that Donald Trump and acting Homeland Security Secretary Chad Wolf used the event to further the president's reelection chances.
President Donald Trump earlier said he plans to have “everybody,” including various law enforcement officials, guard against voter fraud.
Acting Homeland Security Secretary Chad Wolf and acting Deputy Secretary Ken Cuccinelli are not qualified, according to the Government Accountability Office.
The president claimed violence is up in "Democrat-run" cities. "They are liberally run, they are stupidly run," he said.
Oregon's governor is accusing President Donald Trump of blatantly abusing his power.