The US Senate passed a largely symbolic resolution on Tuesday calling for an end to US President Donald Trump's war with Iran, delivering a fresh rebuke to the White House as it tries to negotiate a lasting settlement with Tehran.

The House-passed measure, adopted by the Senate in a 50-48 vote, directs Trump to remove US forces from hostilities with Iran unless Congress explicitly authorizes military action.

Because the measure is a "concurrent resolution," it does not go to Trump's desk for signature and carries disputed legal force. But its passage still puts both chambers of Congress on record against a conflict that began with US and Israeli strikes on Iran in late February.