President Trump has told advisers he has decided to remove Homeland Security Secretary Kirstjen Nielsen, and her departure from the administration is likely to occur in the coming weeks, if not sooner, according to five current and former White House officials.

Trump canceled a planned trip with Nielsen this week to visit U.S. troops at the border in South Texas and told aides over the weekend he wants her out as soon as possible, these officials said. The president has grumbled for months about what he views as Nielsen’s lackluster performance on immigration enforcement and is believed to be looking for a replacement who will implement his policy ideas with more alacrity.

The announcement could come as soon as this week, three of these officials said.