A prominent Democratic senator has introduced a bill to require United States President Donald Trump to first seek authorisation from Congress before ordering military strikes against Iran.
The measure, put forward by Virginia Senator Tim Kaine on Monday, came amid growing calls by pro-Israel groups for the US to join the Israeli bombing campaign against Iran as the attacks between the two countries intensify.
The bill invokes the War Powers Resolution of 1973, passed during the Vietnam War to constrain unilateral presidential powers to engage in military hostilities.
The US Constitution gives Congress the power to declare war, but successive US presidents have used their positions as the commander-in-chief of the armed forces to mobilise troops, initiate attacks and start conflicts without clear congressional authorisation.
