Recent moves by Congress suggest some Republicans are acting more independently from the White House.
The House has passed a measure to stop US President Trump ordering more strikes on Iran.
Four Republicans broke ranks to secure the vote.
Foreign Policy Institute Senior Fellow Jeffrey Pryce told Francesca Rudkin it could now pass in the Senate, which would be significant, even if Trump doesn't sign it into law.
He says some chickens are coming home to roost for the President, particularly those in the Republican Party who have previously incurred his wrath.
Pryce says impending elections will also be on people's minds.
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