An escalating clash pits a Republican president looking to fulfill his mass deportation goals against a Democratic governor with White House aspirations hoping to mobilize opposition.

California Gov. Gavin Newsom has embraced a new attack line in his ongoing showdown with Donald Trump: The president — who turns 79 on Saturday — is slipping. "He is not the same person that I dealt with just four years ago,

Democratic politicians have spent the last few months talking about standing up to President Donald Trump in his second term. California Gov. Gavin Newsom is among the first faced with figuring out what standing up actually looks like.

Gavin Newsom won praise on Wednesday for his speech Tuesday night seen by a national audience, something many Democrats saw as a shot across the bow to President Donald Trump that they can fight Trump -- and one that sparked new talk of Newsom as the party's standard-bearer in 2028.

The public fight between California Gov. Gavin Newsom and President Donald Trump keeps intensifying, with name calling, insults and accusations traded over television and social media networks.

Democrat Gavin Newsom has not been afraid to square off against the president - but this confrontational strategy is not without political risk.

Gov. Newsom's speech confronting Trump's immigration raids in Los Angeles boosts his standing among Democrats as he warns democracy is under assault

California Republicans have found ways to convince Trump he’s helping the state rather than Newsom before, one expert said.

"It clearly will not end here, other states will be next, democracy is next," the California governor says in a speech Tuesday night

The Justice Department claims California's request to limit the federal response to violent riots in Los Angeles would "countermand" the president's lawful military directives.

Georgetown law professor Stephen Vladeck joined "Forbes Newsroom" to discuss the legality behind President Donald Trump deploying members of the National Guard in L.A.