President Donald Trump’s campaign to suppress dissent in his own party faces its most prominent test yet as he takes aim at Rep. Thomas Massie in Kentucky, while GOP candidates across the country look to leverage the president’s endorsement in key primaries.

Republicans face pivotal primaries influenced by Trump's endorsements, with key races in Kentucky, Georgia, and Pennsylvania testing party dynamics and leadership.

San Diego authorities are investigating a shooting at the city’s largest mosque as a hate crime. Three victims were killed and two teenage suspects whom police believe carried out the attack were found dead.

The next test of the president's power to extract retribution is on Tuesday, when Rep. Thomas Massie of Kentucky faces a Trump-backed primary challenger. Massie has been a thorn in the president's side for pushing for the release of the Jeffrey Epstein files,

The coalition behind the letter to President Donald Trump asked Trump to issue an executive order requiring mandatory testing, evaluation, vetting and government approval of frontier artificial intelligence systems before they are released.

Endorsement could help swing the fiercely contested battle between Texas Republican heavyweights.

A Democratic congressman called for the president to take a "cognitive test" after video footage appeared to show President Trump with his eyes closed and motionless during a White House briefing on m

Prosecutors in Spokane, Wash., are trying three activists who they say conspired to impede federal officers. Legal experts call it a stretch.