French finance minister Bruno Le Maire said that there is no legal basis for Trump's tariff threat.
The attack came mere hours after the United States moved against three Iranian-backed Iraqi paramilitary leaders, slapping financial sanctions on them over deadly attacks against protesters.
Riot police and security forces clashed with demonstrators in Tehran and dozens of cities across Iran on Saturday, Iranian news agencies and social media said.
Families of those held in Iran have accused Tehran of "hostage taking" and demanded governments take concerted action.
U.S. seizes North Korean ship it accuses of violating sanctions
The United States has imposed sanctions on Venezuelan state-owned oil firm PDVSA, White House national security adviser John Bolton has said.
Denmark's Foreign Minister Anders Samuelsen said the EU was sending a "strong signal" after agreeing to enact sanctions against Iran's intelligence agency
Everything is in short supply, from basic medicines to bed space, as injuries add to the overstretched system that is close to falling apart, warn doctors and UNWRA.