Republicans struggled Thursday to find the votes to dismiss legislation that would compel President Donald Trump to withdraw from the war with Iran, delaying planned votes on the matter into June.

The measure marks a symbolic win for Democrats and a growing number of Republicans who have questioned the Trump administration's war with Iran.

Four Republicans voted with nearly all Democrats to advance the Iran war powers measure, with GOP Sen. Bill Cassidy joining the Republican defectors for the first time.

House Republicans pulled a vote, through a procedural loophole, that could have reined in President Donald Trump's war powers in Iran.