U.S. military planning on Iran has reached ?an advanced stage with options including targeting individuals as part of an attack and even pursuing regime change in Tehran, if ordered by President Donald Trump, two U.S. officials said.

The military options are the latest signs that the United States is preparing for a serious conflict with Iran should diplomatic efforts fail. Reuters first reported last week that the U.S. military is preparing for a sustained, weekslong operation against Iran that could include striking Iranian security facilities as well as nuclear infrastructure.

The latest revelations suggest more granular, ambitious planning ahead of a decision by Trump, who has in recent days publicly ?floated the idea of regime change in the Islamic Republic.