The US Senate unanimously approved Marco Rubio as secretary of state on Monday, putting the fellow senator on the front line of President Donald Trump's often confrontational diplomacy.

Senator Marco Rubio warned of China’s growing threat, and he backed NATO but said Europe needed to do more to help protect itself. His friendly, five-hour confirmation hearing seemed to all but guarantee he would be the next secretary of state.

Florida Sen. Marco Rubio painted a dark vision of the consequences of America’s “unbalanced relationship” with China.

The Senate voted unanimously to confirm Sen. Marco Rubio (R-FL) as secretary of state on Monday, delivering President Donald Trump the first member of his Cabinet just hours after he was sworn in for a second term.

U.S. Sen. Jeanne Shaheen, D-New Hampshire, questioned secretary of state nominee Marco Rubio on Wednesday as confirmation hearings continued for President-elect Donald Trump's Cabinet picks.

Now-former Sen. Marco Rubio was sworn in Tuesday morning as secretary of state by Vice President JD Vance. He replaces Antony Blinken in the position. The Senate unanimously confirmed Rubio for the position on Monday hours after Trump took office for his second term. The vote was 99-0. No senators voted against Rubio, CNN reported.

Marco Rubio has been confirmed by the Senate as the country’s next secretary of state. The nomination of the senior senator from Florida, 53, was confirmed on Monday, Jan. 20, hours after Donald Trump took the oath of office as the 47th president.

The Senate confirmed Senator Marco Rubio, Republican of Florida, on Monday as America’s 72nd secretary of state, putting a former political rival of President Trump at the helm of American diplomacy.

The Senator is expected to be an easy confirmation, but that didn't mean there was no drama Wednesday morning.

Latest news and updates on the third day of Donald Trump's presidency after his election victory. Follow live.

Trump has halted arrivals of refugees already cleared to enter the US, according to a memo seen Wednesday, as he pursues a sweeping crackdown on migration.