US Congresswoman Delia Ramirez has criticised President Donald Trump over the latest US airstrikes on Iran, accusing his administration of escalating the conflict soon after reaching a ceasefire agreement.

"Last night, Trump launched a series of strikes on Iran, shortly after establishing a ceasefire deal. And today he is threatening to launch more," Ramirez wrote in a post on X.

"We cannot rely on warmongers to bring an end to this war. Congress must reclaim our authority and hold the administration accountable!" she added.

Ramirez's remarks came after US Senator Elizabeth Warren also urged Congress to act to stop Trump's war.

Last month, the US House of Representatives and the Senate approved a bipartisan War Powers Resolution directing the president to halt military action against Iran unless Congress formally declares war or authorises the use of military force.