President Donald Trump is reportedly ready to remove Secretary Kirstjen Nielsen as head of the Department of Homeland Security and may announce her departure as early as this week, five current and former White House officials told the Washington Post.

Trump has been irked by Nielsen’s performance on immigration enforcement for months and canceled a trip with Nielsen this week to the U.S.-Mexico border to visit U.S. troops. Trump is growing increasingly unhappy with her humdrum energy on immigration enforcement and wants to replace her with someone more eager. The President told aides this weekend that he wants to oust her as soon as possible, according to the Post.

Chief of Staff John Kelly is reportedly trying to dull Trump’s impulses on showing Nielsen the exit, or at the least postpone the departure, the Post reported. While Nielsen reportedly does not want to leave the administration until she’s reached her one-year mark on Dec. 6, she’s been despondent about her post for a few months, colleagues told the Post.