An earlier effort by Mr Trump to roll back birthright citizenship was rejected by the US Supreme Court in June, prompting him to call upon Congress to act on what has been one of the top priorities for his administration.

Additional details weren't provided, but Trump said he thought his latest actions would be constitutional.

President Donald Trump says he is once again trying to limit birthright citizenship in the U.S. He says he's signing two executive actions on immigration.

Trump takes aim at ‘birth tourism’, setting up court battle

One of the orders bans "birth tourism."