Iran–United States relations

Trump administration officials say that President Donald Trump ordered the United States Armed Forces to conduct military strikes against targets of the Armed Forces of the Islamic Republic of Iran in retaliation for downing an American surveillance drone the day prior, and that he changed his mind hours later and ordered an immediate stop to the operation while American warplanes were in the air and warships were in position.

Strikes on Iran Approved by Trump, Then Abruptly Pulled Back

Sources:  ABC News  The New York Times