The US House of Representatives rejected an effort on Thursday to stop President Donald Trump's air war on Iran and require that any hostilities against Iran be authorized by Congress, backing the Republican president's military campaign on the sixth day of the expanding conflict, Reuters reports.

The vote was 219 to 212, largely along party lines, in the House, where Trump's fellow Republicans control a narrow majority of seats. Two Republicans voted in favor of the resolution and four Democrats voted against it.

The Senate, also narrowly controlled by Trump's party, backed his military campaign against Iran in a vote on Wednesday, voting to block a bipartisan resolution similar to the measure passed by the House.