A Republican former congressman turned lobbyist repeatedly pushed for the dismissal of U.S. Ambassador to Ukraine Marie Yovanovitch, an action later taken by President Donald Trump after he was urged to do so by his personal lawyer, Rudy Giuliani, a U.S. diplomat said in testimony on Wednesday.

Catherine Croft and Christopher Anderson, Ukraine specialists at the State Department, became the latest current and former U.S. officials called as witnesses in the Democratic-led impeachment inquiry against the Republican president in the House of Representatives.

Croft, who testified for roughly five hours after being subpoenaed, said she was a member of the National Security Council (NSC) staff at the White House from July 2017 to July 2018.