GOP front-runner Donald Trump says he'd like to bring Florida Sen. Marco Rubio into his campaign as part of his effort to unify the party. Trump already has the support of two of his vanquished foes: New Jersey Gov. Chris Christie and retired neurosurgeon Ben Carson. "Frankly, Marco I'd love to have involved," Trump said Thursday on Fox News Channel's "Hannity." "This party has to unite," Trump said. "Then you're going to have the House and Senate." Rubio dropped out of the race after losing his home state of Florida, but has yet to endorse anyone. Trump also responded to...