WASHINGTON, Feb 27 (Reuters) - U.S. President Donald Trump expressed disappointment ⁠on ⁠Friday about U.S. negotiations with Iran over its nuclear ⁠program and warned that "sometimes you have to use force," amid a massive military presence in the region that could ​presage strikes on the Islamic Republic.

Fox News senior foreign policy correspondent Gillian Turner reports on the latest in the mounting tensions between the U.S. and Iran amid negotiations on 'Special Report.'

Some U.S. embassy staff in Israel have been told to leave the country quickly in a message which will be seen as another sign of a possible American attack on Iran as threatened by President Donald Trump.

The unrest underlines the intensity of domestic discontent, even as Tehran’s government grapples with the threat of U.S. strikes. Here’s what to know.

As Trump leaves the threat of war on the table amid nuclear talks with Iran, the State Department urges Americans to "consider leaving Israel" while they can.

The State Department cautioned that sudden travel restrictions, rocket alerts, and flight disruptions are possible.

The U.S. is pulling some non-emergency staff and their families out of Israel with the possibility of a strike on Iran still on the table Friday.

Trump warns Iran missiles could "soon reach" U.S. as tensions escalate. Iran's current arsenal threatens American forces across Middle East Gulf bases.

Tehran has strongly dismissed recent allegations by the United States and Israel regarding its nuclear program, ballistic missiles, and casualties during January unrest. “Whatever they're alleging in regards to Iran's nuclear program,