Marco Rubio: Trump's 'anger' isn't a plan for America

Sen. Marco Rubio said Trump's mantra, 'We're gonna make America great,' shouldn't be enough to win voters' support. 'How?' Rubio asked. 'You deserve to know that.'

In a swipe at the his party's front-runners, Republican White House hopeful Marco Rubio charged Saturday that anger alone isn't enough to qualify someone to be president.

"We also have to have someone for president who knows exactly what they're going to do when they get there," the Florida senator said, as he courted Iowa voters ahead of the state's Feb. 1 caucuses.

Rubio called out leading candidates, real-estate mogul Donald Trump and Texas Sen. Ted Cruz, by name during a town hall-style meeting in Johnston, Iowa, the first of four scheduled campaign appearances Saturday. Trump and Cruz are surging in the polls, in part, by successfully tapping into conservative anger about the direction of the country.

In a debate this week, Trump declared that he "gladly" accepted "the mantle of anger."

"Obviously, I share the frustration that others have about the future of our country and where it's headed. But I'm going to detail exactly what we're going to do about it," Rubio said. "Donald hasn't done that, whether it's on national security or on the other issues. I think that's a huge difference."

At a campaign stop in Council Bluffs, Rubio said Trump's mantra, "We're gonna make America great," shouldn't be enough to win voters' support.

"How?" Rubio asked. "You deserve to know that."

Rubio also condemned Senate colleague Cruz for supporting federal budgets that would decrease defense spending and for proposing a "European-style" value-added tax. Cruz's tax plan, in particular, would "really hurt seniors," Rubio said.

And repeating criticism he outlined in Thursday's debate, Rubio likened New Jersey Gov. Chris Christie's policies to those of President Barack Obama. The Florida senator accused Christie of supporting Common Core education standards, gun control and the Supreme Court nomination of Sonia Sotomayor.

"I would never support someone like that to the Supreme Court," Rubio charged.

Christie has disputed the assertion that he backed Sotomayor, but in 2009 Christie said, "I support her appointment to the Supreme Court and urge the Senate to keep politics out of the process and confirm her nomination."

Rubio promised to avoid personal attacks in the days leading up to the Iowa caucuses, but would continue to outline policy differences between his Republican rivals.

"These are policy differences," he said. "We're all going to be on the same team soon enough."

Rubio has been criticized for not spending as much time on the ground in early voting states as some of his Republican competitors. He chartered a private plane to make four stops on Saturday and another five on Monday.

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