Iran said on Monday that President Donald Trump is relying on an unsubstantiated, political justification to attack its nuclear enrichment program while ignoring U.S. intelligence that concluded the country is not building a nuclear weapon.

France, Britain and Germany have threatened to trigger the “snapback mechanism” that automatically reimposes all United Nations sanctions on Iran over its nuclear program.

Three European powers will meet with an Iranian minister to try to reopen negotiations over Iran’s nuclear activities and avoid reimposing harsh sanctions.