Progressives demanded unified opposition before President Trump announced U.S. strikes against Tehran's nuclear program, but Democratic Party leaders were treading more cautiously.

The U.S. military has hit three sites in Iran and inserted itself into Israel’s effort to decapitating Iran’s nuclear program in a risky gambit to weaken a longtime foe

Prior to the attack, Iran had threatened to retaliate against the U.S. if it became involved in its conflict with Israel.