UPDATE [10/11/17, 5:18 p.m. ET]:
The White House has announced Trump has officially nominated Nielsen to lead the Department of Homeland Security.
In the White House's statement, it touted Nielsen's professional experience with homeland security issues as well as her previous positions in the department.
“Ms. Nielsen has extensive professional experience in the areas of homeland security policy and strategy, cybersecurity, critical infrastructure, and emergency management. She is the first nominee for this position to have previously worked within the Department of Homeland Security, having served there in two administrations,” the statement read.
Original Story Below:
Kirstjen Nielsen, Chief of Staff John Kelly's No. 2 in the White House and previously at the Department of Homeland Security (DHS), may be taking her boss's old job as DHS secretary.
Five sources told Politico that President Donald Trump is expected to nominate Nielsen, currently the White House's Principal Deputy Chief of Staff, as soon as Wednesday. Neither the White House nor Nielsen responded to requests for comment, however, and sources cautioned against jumping to conclusions.
Before working under Kelly while he was secretary, Nielsen worked in one of DHS's agencies, the Transportation Security Administration (TSA), and served former President George W. Bush's Homeland Security Council.
Nielsen is a cybersecurity expert but joined the White House to help Kelly when he became Trump's chief of staff in July.
According to Politico, White House aides recognize Nielsen for her no-nonsense approach, apparently in stark contrast to the way former Chief of Staff Reince Priebus handled things. She's also helped the White House take a more disciplined approach to policymaking and helped reduce the traffic of advisers going in and out of the Oval Office.