(WASHINGTON) — President Donald Trump’s nominee for secretary of state headed for approval in a key Senate committee Monday after Florida Sen. Marco Rubio announced his support, backing off from a challenge to the new president. Rubio said that despite serious reservations about former Exxon Mobil CEO Rex Tillerson, particularly over his views on Russia, he believed a president was entitled to significant deference in assembling his Cabinet. “Despite my reservations, I will support Mr.