The Democratic candidate questioned Trump's memories of Muslims celebrating on 9/11.
The GOP front-runner says a super-PAC's attacks prove he isn't being treated fairly.
“I want an apology,” he tweeted. "Many people have tweeted that I am right.”
They are ramping up attacks as Trump has a campaign event in the Ohio governor's state.
"I saw film of it," Carson said of Muslims in the U.S. cheering on 9/11.
The nation’s five leading television networks are banding together.
Huckabee says Obama would rather confront critics at home than radical Islamic terrorists.
The Democratic presidential candidate has 11.2 percent of the vote in an online survey.
This is Clinton's 14th union endorsement.