Ms. Nielsen would replace John F. Kelly, who left the department in July to serve as the chief of staff in Mr. Trump's chaotic White House.
Kirstjen Nielsen, Chief of Staff of U.S. Department of Homeland Security, center, walks to Air Force One as she departs Tuesday, Aug. 22, 2017, at Andrews Air Force Base, Md.
President Trump has selected Kirstjen Nielsen, a top White House aide and a former homeland security official in the George W. Bush administration, to lead the Department of Homeland Security, according to two senior administration officials and another person familiar with the decision. "She has a deep familiarity". Earlier in her career she worked as a corporate attorney, and as a Capitol Hill staffer. Her "rigid style" under Trump's chief of staff and her emphasis on professionalism had some White House staffers calling her "Nurse Ratched", Politico reported last month.
Nielsen holds degrees from the Georgetown School of Foreign Service and the University of Virginia Law School.
She previously served as special assistant to the president for prevention, preparedness and response on the White House Homeland Security Council under President George W. Bush and launched the Offices of Legislative Policy and Government Affairs at the Transportation Security Administration. Moved to DC from Texas after 9/11 to help stand up TSA. Most importantly, in this hyper-political environment, Kirstjen is not a self-promoter. "I think her no-nonsense, business-like manner is what earned the confidence, first of General Kelly, and now the President".
The announcement could come as soon as Wednesday, although the sources cautioned nothing is set until Trump publicly announces her as the pick.