The GOP conflict is the most public — and heated — of any since Republicans lost the 2012 elections.
The former lawmaker said he had a "lot of concerns" about the immigration bill Rubio helped draft.
Sen. Ted Cruz (R-Texas) will head to Iowa in July, intensifying speculation that the freshman lawmaker and Tea Party darling might be considering a bid for the White House.
Cruz will headline the state party's annual summer picnic on July 19, CNN reported on Friday.
The Texas lawmaker joins a bevy of other potential Republican hopefuls who have traveled to the Hawkeye State in recent months. Sen. Rand Paul (R-Ky.) addressed the Lincoln Day Dinner; Wisconsin Gov. Scott Walker addressed party leaders in Des Moines; and Rick Santorum, who won the caucuses in 2012, is scheduled to attend the State Fair in August.
Sen. Ted Cruz (R-Texas) is weighing a presidential run in 2016, according to a report in the National Review.
The freshman lawmaker has already made waves in conservative circles with his aggressive questioning of Defense Secretary Chuck Hagel and his willingness to filibuster the Senate's attempt at expanding background checks on gun purchases. According to the conservative magazine, GOP leaders in early voting states are already encouraging Cruz to consider a bid.
“Ted won’t be opening an Iowa office anytime soon, but he’s listening,” an anonymous source identified as a "longtime Cruz associate" told the National Review. “This is all in the early stages; nothing is official. It’s just building on its own.”
Sanford's opponent is showing some momentum in the closing days of the GOP primary for the state’s open House seat.
The head of a conservative super-PAC called the RNC "ridiculous to spend $10 million on a ‘re-branding campaign.’”
The challenge now facing the first-term senator, say GOP operatives, is finding a way to stay there.
Who would have guessed Big Bird would be THE story out of the first presidential debate?
President Obama has hammered Mitt Romney on the issue repeatedly since last week’s showdown, but it was an Obama campaign ad Tuesday that brought the issue to the head.
In the attack ad, Team Obama hit Romney on his comment that he would defund PBS, comparing Big Bird to corporate titans prosecuted for financial misdeeds.
"Bernie Madoff. Ken Lay. Dennis Kozlowski: Criminals. Gluttons of greed. And the evil genius who towered over them?" a voice-over says as a silhouette of Big Bird moves on screen.
The Sesame Street Workshop, the group behind the popular children’s show, asked the Obama campaign to take the ad down:
"Sesame Workshop is a nonpartisan, nonprofit organization and we do not endorse candidates or participate in political campaigns," the group said in a statement on its website. "We have approved no campaign ads, and as is our general practice, have requested that the ad be taken down."
Team Obama said it is considering the request. But Obama continued to mention Big Bird, bringing him up in an afternoon campaign stop in Ohio.
Romney, meanwhile, slammed Obama for talking about Big Bird.
Mitt Romney launched an aggressive new attack on President Obama on Monday, hitting the president for describing the recent events in the Middle East as "bumps in the road."
"These are not bumps in the road, these are human lives," Romney told a crowd in Pueblo, Colo. "These are developments we don't want to see."
Obama made the comments on “60 Minutes” during a larger discussion of whether recent events had given him any pause in his support for governments that had formed following the Arab Spring.
"I think it was absolutely the right thing for us to do to align ourselves with democracy, universal rights, a notion that people have to be able to participate in their own governance," Obama said. "But I was pretty certain and continue to be pretty certain that there are going to be bumps in the road because, you know, in a lot of these places, the one organizing principle has been Islam."
Romney’s attacks come as his campaign said it would debut a new "change in message" that looked not just to criticize Obama's record, but to paint a contrast for voters of the next four years.
The five states penalized for shifting their presidential primaries earlier than RNC rules permit will retain those penalties.