Kirstjen Nielsen—who abruptly quit her Homeland Security Secretary role Sunday evening—has vowed to stay on for an “orderly transition” to her successor, for two days. Nielsen resigned following a meeting with Trump on Sunday and reportedly had no intention of quitting beforehand. However, it seems Trump had other ideas and became determined to ask for her resignation over disagreements about immigration policy. He's installed Kevin McAleenan, the current U.S. Customs and Border Protection Commissioner, as her acting replacement. But Nielsen hasn't gone quite yet—and has promised to make the honorable sacrifice of staying on to oversee the transition, for 48 more hours. “I have agreed to stay on as Secretary through Wednesday, April 10th to assist with an orderly transition and ensure that key DHS missions are not impacted,” she announced on Twitter late Sunday. Nielsen said in her resignation letter Sunday that she’s “immensely proud” of her department’s work during her tenure to outpace the nation’s adversaries.