The acting head of US Homeland Security, Kevin McAleenan, has resigned after six months in the post.
In a tweet, President Donald Trump said Mr McAleenan wanted to spend more time with his family. He said his replacement would be named next week.
Mr McAleenan is the fourth person to serve as the head of Homeland Security during Mr Trump's tenure.
He oversaw the president's controversial border policies aimed at curbing immigration.
Recently he was shouted off stage by student protesters at a university in Washington DC.
Announcing his resignation, Mr Trump said Mr McAleenan had done "an outstanding job".
"We have worked well together with border crossings being way down," he said.
"Kevin now, after many years in government, wants to spend more time with his family and go to the private sector."
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