By Official U.S. Navy Page from United States of America MC3 Andre T. Richard/U.S. Navy [Public domain], via Wikimedia Commons
On May 12th several oil tankers were attacked in the Persian Gulf. The United States blamed Iran for the attacks but Iran denied any involvement in the attack and rebuked the US.
June 20, 2019
On June 20th, 2019 the United States shot down a US drone and took full credit for the incident. Iran defended its action by claiming that the drone was violating US airspace. The United States rejected this notion and prepared to launch a strike on Iran, the President ultimately halted the strikes before they went through.