Secretary Rubio’s new role as national security adviser may be unsustainable, according to foreign policy experts.

In a dramatic shift in fortunes, Rubio is the first person since Henry Kissinger to be both secretary of state and national ...

FOX News host Sean Hannity asked Secretary of State Marco Rubio for an update on U.S. attempts to get Russia and Ukraine to ...

Germany’s foreign ministry hit back at U.S. Secretary of State Marco Rubio after he criticized the decision to classify the ...

Secretary of State Marco Rubio indicated Thursday that a peace deal between Russia and Ukraine is still on the horizon but ...

U.S. lawmakers have asked the State Department to brief them about Russia's use of Chinese fighters in its war in Ukraine, ...

Secretary of State Marco Rubio said there are reasons to be optimistic, but also asserted there are “other issues” on which ...

The decision by Secretary of State Marco Rubio to pull out of the meeting and an objection by Ukraine’s leader to a key U.S.

The U.S. secretary of state rejects a report that the White House would lift sanctions on the Nord Stream 2 natural gas ...

Fox & Friends co-host Brian Kilmeade took a jab at Secretary of State -- and newly-minted National Security Adviser -- Marco ...

U.S. Secretary of State Marco Rubio stated Ukraine cannot force Russia to retreat to its 2014 borders, signaling a potential ...