Nielsen currently is the White House principal deputy chief of staff.
HHS Secretary Tom Price has resigned after a series of reports claimed he spent over $1 million of taxpayer money on private flights.
U.S. marshals are protecting Education Secretary Betsy DeVos at a cost of about $1 million per month.
Rex Tillerson gave one reporter from the Independent Journal Review a rare interview about his role as secretary of state.
Alexander Acosta has a strong background as an attorney and previously served under President George W. Bush.
The president reportedly offered Harward the job shortly after Michael Flynn's resignation. It's unclear whether Harward has accepted the offer.
In his resignation letter, Flynn admitted giving VP Mike Pence "incomplete information" about conversations with the Russian ambassador to the U.S.
One minute National Security Adviser Gen. Michael Flynn enjoyed "the full confidence of the president." The next, not so much.
Senators voted 52 to 47 to approve U.S. Rep. Tom Price's nomination.
The vote came after Democrats held the Senate floor for more than 24 hours hours speaking about their opposition to his confirmation.
DeVos was one of President Trump's most controversial Cabinet picks.
Vincent Viola says he can't be Army secretary because his business conflicts of interest are too vast.