Donald Trump's sweeping changes to US policy are already garnering pushback.  

Trump's immediately begun wielding his new presidential powers, signing off 26 orders and backtracking 78 of Joe Biden's after being sworn in

His withdrawals from the World Health Organisation and the Paris Climate Agreement have prompted global concern.

US Correspondent Nick Harper told Francesca Rudkin the new Department of Government Efficiency is already facing three lawsuits.

He says the decision to end birthright citizenship is also being challenged, with claimants coming forward saying he has no authority to redefine American citizenship.

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