Donald Trump

Former President Donald Trump’s winning streak in U.S. Senate primaries is on the line Tuesday as voters in five states cast their ballots in midterm elections. Trump backed celebrity heart surgeon Mehmet Oz and state Sen. Doug Mastriano in Pennsylvania's Republican primary for U.S. Senate and governor, respectively.

Donald Trump has endorsed Doug Mastriano in the Republican primary for governor in Pennsylvania. The former president is casting aside hand-wringing by party insiders who fear that the far-right candidate will be able to win the nomination in Tuesday's vote but will lose in the general election in November.

Sensing a threat in Pennsylvania’s U.S. Senate race, Donald Trump has issued a warning that surging Republican candidate Kathy Barnette would upend the GOP’s chances of holding the seat in November. He is urging voters to back his pick, TV’s Dr. Mehmet Oz.

Several prominent conservative groups are lining up behind Pennsylvania Republican Senate candidate Kathy Barnette as an alternative to Mehmet Oz, the celebrity heart surgeon endorsed by former President Donald Trump.

Mehmet Oz’s rivals in Pennsylvania’s Republican primary for U.S. Senate are escalating their attacks on the celebrity heart surgeon’s connections to his parents’ native country of Turkey, raising it as a possible national security issue.

Former President Donald Trump appeared Friday night at the Westmoreland Fairgrounds in support of Dr. Mehmet Oz's campaign for the U.S. Senate.

Republicans hoping to emerge from crowded primaries this year have spent tens of thousands of dollars hiring operatives with ties to former President Donald Trump. They're betting those connections will give them a leg up on landing critical endorsements that will help them win. But as Trump has gotten off the fence and weighed in on some of the year’s most competitive primaries, that strategy has proven a bust.

To date, White has dumped $4 million of his own money into his campaign — more self-funding than any other candidate in the race.

Former President Donald Trump’s late endorsements in hypercompetitive Republican Senate primaries in Pennsylvania and Ohio have unlocked a flood of support for his chosen candidates. But some Republicans believe Trump has betrayed his core supporters by backing TV’s Dr. Mehmet Oz in Pennsylvania and author JD Vance in Ohio.

For the state's open U.S. Senate seat, the two top Republican contenders are David McCormick and Mehmet Oz. And, as in so many GOP races this year, there's another major player — Donald Trump.