Former U.S. senator from Florida Marco Rubio jumps into new role as secretary of state with flurry of phone calls, planned trip to Panama.

Rubio said he could not predict if Trump would succeed in buying Greenland from Denmark or restoring American authority over the Panama Canal while he is in office.

A Taliban envoy cautioned U.S. Secretary of State Marco Rubio against rising tensions with threats of bounties on Afghan leaders.

WASHINGTON (AP) — For Marco Rubio, the easy part is over ... coupled with Rubio’s longstanding hawkish views on Russia and support for America’s role in NATO, is what some worry will eventually make him the target of Trump’s wrath.

U.S. Secretary of State Marco Rubio's trip to Central America, including Panama, is partially about countering China, a State Department spokesperson told Fox Business, as new President Donald Trump is pushing to "take back" the Panama Canal.

European Union foreign policy chief Kaja Kallas and U.S. Secretary of State Marco Rubio discussed the Ukraine war, Iran and China on Tuesday in their first phone call since the Trump administration took office on Jan.

A Taliban ambassador is warning new U.S. Secretary of State Marco Rubio against making threats after he said he would place bounties on Afghanistan’s rulers for their continued detention of U.S. natio

Yes, by all means, Secretary of State Marco Rubio should be “realistic” about Ukraine. Let’s win.

US President Donald Trump is serious about seeking to buy Greenland, Secretary of State Marco Rubio said Thursday, after Denmark was rattled by his threats to take over the autonomous Danish territory.

President Donald Trump is serious about seeking to buy Greenland, Secretary of State Marco Rubio said in an interview on Thursday.

Secretary of State Marco Rubio asserts that President Trump’s interest in acquiring Greenland and reasserting control over the Panama Canal stems from legitimate national security threats posed by China’s growing influence in these strategic areas.