Rubio has been criticized for clearing the path to Tillerson's confirmation after previously telling reporters he was "prepared to do what’s right," hinting at a possible vote against Tillerson, the former head of ExxonMobil.
“In the end, I think Marco decided that it was better to be inside the tent than outside,” a source close to Rubio told BuzzFeed News. “A vote against Tillerson would have reduced his influence on foreign policy matters with the Trump Administration to zero.”