President Donald Trump is as dominant as ever over the Republican Party. His grasp on the U.S. Senate is a different story.

President Donald Trump abandoning Sen. John Cornyn destabilizes the White House's already-rocky relationship with Senate Republicans.

Donald Trump's power over Republican voters faces another test Tuesday in Texas, where veteran Senator John Cornyn is fighting long odds after the president endorsed…

Sen. John Cornyn’s landslide defeat Tuesday immediately raised a pressing question for his GOP colleagues: Will he join the ranks of other Republicans recently vanquished by…

Sen. John Cornyn is just the latest high-profile Republican incumbent to learn that in today’s GOP, conservative credentials are no match for Trump’s grip on the party.

President Donald Trump has been showcasing his influence in Republican primaries, recently endorsing Ken Paxton in Texas.

President Trump's strong influence in Republican primaries presents a challenge for the party's upcoming midterm elections. Voters are reportedly unhappy with his economic…

The primary defeat of long-time Senator John Cornyn confirms Trump still has a grip on the party, but comes with huge political risks – and Democrats are excited.

President Donald Trump's tightening grip on his party could make it harder to win in the November midterms, when Republicans face a broader electorate that has soured on the…

So much Trump winning. So much Republican losing.

President Donald Trump is as dominant as ever over the Republican Party. His grasp on the U.S. Senate is a different story.