Trump issued a new warning to Iran and its supreme leader, Ayatollah Ali Khamenei, ahead of expected talks over Tehran's nuclear program.

Trump threatens Iran with military action while pursuing diplomatic talks. Recent drone shootdowns escalate tensions as diplomatic summit approaches.

US President Donald Trump warned Iran’s supreme leader should be “very worried,” as both sides prepare for their first formal negotiations since the US bombed Tehran’s nuclear program last year.

President Donald Trump has threatened to launch military strikes on Iran if the Islamic Republic doesn't agree to a deal on its nuclear program.

“He’s in a situation where he needs to do something,” Brit Hume said.

The president said the U.S. will "hopefully" make a deal with Tehran.

The U.S. is continuing its military buildup in the Middle East, with President Trump hinting at a possible attack. Iran struck back this weekend, warning of a regional war if the U.S. attacks. NPR's Greg Myre reports.

President Donald Trump said Iran is negotiating “seriously" with the U.S. as he keeps military options on the table and American naval forces move into the region.