The union powerhouse, which represents 12.5 million workers, told Reuters the ads will depict Trump as anti-union and will appear on Facebook and Twitter.
The GOP front-runner, who's bragged about being self-funded, seems to be warming to some fellow billionaires.
Just a week after dropping out of the 2016 presidential race, Carson said Friday that Donald Trump is “actually a very intelligent man who cares about America.”
Texas Sen. Ted Cruz says he can beat Hillary Clinton in the general election, but it would likely be a competitive race.
Noting he's self-funding his campaign, Trump noted Cruz's major campaign finance support.
Marco Rubio disagreed with Donald Trump over the front-runner’s comments on Islam during Thursday’s debate.
Videos from the standoff between Trump, Cruz, Rubio and Kasich.
Thursday's debate comes ahead of next week's "Super Tuesday 3," when more than 350 delegates up for grabs, including in Florida and Ohio.
Trump said Thursday that he would cut fraud to save Social Security. The numbers don't add up, a report shows.
Here’s a breakdown of who has won which states and how many delegates thus far.
Days ahead of primaries in Ohio, Florida and other states, Republicans toned down the rhetoric on Thursday.
The four remaining candidates in the 2016 GOP primary race are set to take the stage in Miami, just days before the Florida primary.
The campaign said Thursday there was no evidence to support the claim.
A 1964 presidential campaign ad is making waves on the internet for its striking parallels to the 2016 presidential campaign.
The Wisconsin congressman, who some in the GOP tout as an alternative to Donald Trump, says he has no interest in a presidential run.
Donald Trump's comment on CNN provoked disbelief — and inspired a hashtag poking fun at the absurdity of it.
Thursday night’s debate occurs ahead of Florida’s primary election on Tuesday.
While Canada has accepted more than 26,000 refugees from the war-torn country, the United States has accepted fewer than 1,000.
The stakes are high, the candidate field is narrowing, and the only thing that can make the Republican presidential debate any more exciting is some booze.
The four remaining Republican contenders will take to the debate stage Thursday evening in Florida, days before the state is set to hold its primary.
Use this calculator to see how your take-home pay will change if your candidate wins the presidential election.
Trump has said Clinton shouldn’t be allowed to run for president because of the investigation into her use of a private server during her tenure at the State Department.