Follow live updates and the latest news coverage as the U.S. and Israel strike Iran, Tehran hits back across the Gulf, and Americans are stranded in the Middle East.

The West Asia conflict expanded to include Iran-backed militias on Monday with an attack by Hezbollah on Israel. Israel struck back against the group in Lebanon while the United States pounded targets in Iran.

President Donald Trump is set to speak at around 10:00 a.m. at the Shield of the Americas Summit in Doral, Florida. The summit first gained attention on Thursday, when Trump fired Kristi Noem from her role as Homeland Security Secretary and appointed her instead as Special Envoy for The Shield of the Americas.

President Donald Trump said Iran would be "hit very hard" on Saturday.

Follow live updates on President Trump and national politics for the latest news, analysis and more from Washington.

President Trump is urging for regime change in Iran and warning against retaliation, with Israel launching another round of strikes in the Middle Eastern country Sunday. Overnight, the president threatened to strike Iran “with a force that has never been seen before” if Tehran retaliates “very hard” against the U.

Watch livestream of President Trump's State of the Union address tonight, Feb. 24, on USA TODAY's YouTube channel.

President Donald Trump announced "major combat operations" against Iran on Saturday, with massive joint U.S.-Israel strikes attack targeting military and government sites, officials said. Iranian state television confirmed that Ayatollah Ali Khamenei was among those killed by airstrikes in Tehran on Saturday.

Alexis McAdams breaks down the graphic social media posts and hotel room evidence.

Get live updates and the latest news as Trump says Kristi Noem's ouster 'wasn't a hard choice,' DOJ releases Epstein files allegations about Trump, and Rep. Tony Gonzales drops his re-election bid.