The US Senate rejected a measure aiming to limit US President Donald Trump's war powers, a day after four GOP senators helped pass a resolution that called for the removal of US forces from Iran.

Four Senate Republicans crossed party lines to approve the resolution, which passed the House earlier this month.

Four Republicans joined Democrats to back a measure seeking to limit the US president’s military authority

Upper house votes 50 to 48 to limit Trump's military authority against Iran

Two Republican senators switch vote and reject measure seeking to limit Trump's war powers in the military conflict with Iran.