Last week, Rubio made history again when Trump tapped him as national security adviser after former U.S. Rep. Mike Waltz, another Floridian, was ousted and nominated to be U.N. ambassador. Of the new job, Trump told NBC News, “Marco’s very busy doing other things, so he’s not going to keep it long term.”

Secretary of State Marco Rubio now holds four top roles in the Trump administration, raising questions about power, trust – and whether one man can do it all.

Rubio’s position as both secretary of state and national security adviser further elevates his profile in the Trump administration. What will that mean for China policy?

When Marco Rubio ... rise has come with its fair share of criticism. He’s been accused of abandoning our allies — most notably remaining silent during a contentious Oval Office meeting between ...

U.S. Secretary of State Marco Rubio will testify this week before his former colleagues in the U.S. Congress, some of whom have said they regret voting to confirm the ex-senator because he has not stood up to President Donald Trump.

As part of a deep dive into former Sen. Marco Rubio's immersion into Donald Trump's administration, one of the Florida Republican's aides admitted his boss was not hired for his foreign affairs experience.