After taking the oath of office, Marco Rubio promised that every action taken by the State Department will be determined by the answers to three questions.

Marco Rubio has been confirmed by the Senate for secretary of state with unanimous support. Now comes the hard part that could make or break his tenure: retaining the full backing of his new boss, Donald Trump.

Rep. Elise Stefanik is expected to champion President Donald Trump's "America first" agenda on the global stage.

Rubio called China the "most potent, dangerous adversary" during his confirmation and is expected to work with India, Japan, and Australia to counter this.

On his first full day as secretary of state, Marco Rubio is meeting with his counterparts from a group of countries known as the Quad: the United States plus India, Japan and Australia, representing nearly 2 billion people and more than a third of global GDP.

The Senate voted unanimously to confirm Sen. Marco Rubio's as secretary of state on Monday, making him the first member of President Donald Trump's second Cabinet.

Secretary of State Marco Rubio said that the United States will seek to prevent and avoid conflict, but never at the expense of its national security, interests and core values, as the former Florida senator took office to lead the State Department.

He was also a candidate in the 2016 GOP presidential primary race, where Trump dubbed him "Little Marco" and Rubio warned voters not to support Trump, saying "friends do not let friends vote for ...

Washington — Sen. Marco Rubio, President-elect Donald Trump's pick to lead the State Department as secretary of state, called China "the most potent and dangerous near-peer adversary this nation ...

WASHINGTON – Last time Donald Trump won office, it was Sen. Marco Rubio asking the probing questions. The Florida Republican used his perch on the Senate foreign affairs panel to grill Trump ...

WASHINGTON (AP) — Florida Sen. Marco Rubio on Wednesday painted a dark vision of the consequences of America’s “unbalanced relationship” with China, echoing President-elect Donald Trump ...