French President Emmanuel Macron was convening key ministers and experts on Wednesday to discuss Iran, including its nuclear program, amid growing tensions between Tehran and US President Donald Trump, three diplomatic sources said, Reuters reports.

Such a cabinet meeting dedicated to a specific subject is rare and highlights mounting concern among Washington’s European allies that the United States and Israel could launch airstrikes on Iran’s nuclear facilities unless there is a quick negotiated deal on its nuclear program.

US Defense Secretary Pete Hegseth has reinforced US military capability in the Middle East with more warplanes, the Pentagon said on Tuesday, amid a US bombing campaign against the Houthis who control much of Yemen and are supported by Iran.

A senior European official said European strategists were asking themselves whether the campaign could be a precursor to a US strike on Iran in the coming months.

Trump, who has urged Iranian Supreme Leader Ali Khamenei to engage immediately in negotiations, threatened Iran on Sunday with bombing and secondary tariffs if it did not come to an agreement over its nuclear program, which Western countries say amounts to weapons development.

The foreign minister of Iran’s direct adversary Israel will be in Paris on Thursday. Diplomatic sources said ministers from France, Britain and Germany were hoping to discuss the Iran dossier with US Secretary of State Marco Rubio when they convene in Brussels for a NATO ministerial meeting this week.

Trump withdrew the US from a 2015 deal between Iran and world powers that placed strict limits on Tehran’s nuclear activities in exchange for sanctions relief. Also, Trump reimposed sweeping US sanctions.