White House Chief of Staff
In January 2019, Mulvaney became Acting White House Chief of Staff. In a White House press conference held on October 17, 2019, Mulvaney said the White House had withheld military aid in part until Ukraine investigated an unsubstantiated theory that Ukraine, not Russia, was responsible for hacking Democratic Party emails in 2016. Mark Meadows succeeded Mulvaney as White House Chief of Staff.