The State Department is pulling staff from Middle East embassies as the Pentagon reportedly relocates troops from regional bases

US President Donald Trump has threatened to launch another military operation against Iran, as Washington quietly withdraws diplomatic personnel and relocates troops from bases across the Middle East in moves resembling preparations ahead of the initial US-Israeli strikes in February.

"We may do another little Epic Fury, or they'll agree," Trump declared during a campaign rally in Florida on Friday, referring to the military offensive launched against Iran on February 28.

"If they're smart, they'll just say, let's get down to business," he added, before expressing doubt that Tehran would agree to Washington's demands.

The Pentagon officially declared Operation Epic Fury over on May 5, even as the conflict continued. The administration has sought to avoid formally characterizing the hostilities as a war, maintaining that the fighting had diminished. Trump reiterated on Friday that previous US strikes had "obliterated" Iran's nuclear enrichment capacity and defeated the country "militarily, financially and otherwise."

Trump's latest threat comes as the State Department has announced staffing reductions at four more embassies across the Middle East, citing alleged threats from Iran and Yemen's Houthis.

The diplomatic missions in Jordan, Lebanon, Qatar and the United Arab Emirates will remain open but operate with fewer personnel. Unlike in Saudi Arabia, where nonessential staff and their families were ordered to leave earlier this week, personnel at the other embassies are not required to depart.

A separate intelligence memo sent to Secretary of State Marco Rubio on Friday claimed that Tehran had intensified efforts to target Americans abroad.

"The lethal plotting efforts by the Iranians against US citizens have reached advanced stages in both the Middle East and certain other countries," Director of National Intelligence Jay Clayton wrote in the document obtained by AP and Axios.

The memo did not publicly identify specific targets or provide evidence substantiating the alleged plots. US officials have denied that the diplomatic withdrawals are connected to preparations for renewed strikes against Iran.

However, the drawdowns coincide with reports that the Pentagon has quietly begun relocating troops from bases in Jordan, Qatar and Kuwait. NBC News reported the movements on Wednesday, with CBS subsequently confirming the reductions.

Similar precautions were taken before the February 28 offensive, when the Pentagon evacuated troops from vulnerable installations ahead of anticipated Iranian retaliation. Tehran subsequently accused Washington of using Gulf residents as "human shields" after American military personnel reportedly relocated to civilian hotels and office buildings.

The Pentagon reportedly presented Trump with options for renewed strikes against Iranian nuclear facilities, underground military installations and strategic islands, including Kharg Island, a major oil export hub.

Trump has pledged not to launch new attacks before the November 3 midterm elections, while keeping military action on the table if Tehran refuses Washington's demands.