By Zehra Nur Duz
ANKARA (AA) - U.S. Homeland Security Secretary Kirstjen Nielsen is leaving her post, President Donald Trump announced Sunday.
On Twitter, Trump said: "I would like to thank her for her service."
He said Kevin McAleenan, the current commissioner of Customs and Border Protection, would serve as acting secretary.
"I have confidence that Kevin will do a great job!" Trump wrote.
Nielsen had a turbulent tenure that saw Trump regularly ramping up the pressure to execute his immigration promises.
She took over the cabinet post in December 2017.
Nielsen reportedly handed in her resignation to Trump during a meeting Sunday afternoon.