Sen. Marco Rubio (R-Fla.) on Tuesday ruled out the possibility of being on the GOP presidential ticket in 2012.

A day after saying he won’t run for president, Rubio, a rising conservative star, told Fox News's Sean Hannity he wouldn't be the vice presidential nominee either.

"No, I'm not going to be the vice presidential nominee, and it's important that I have this attitude because otherwise I won't be able to do this job well," Rubio said, who is in his first term in the Senate.

Rubio repeated his previous statement that he is focused on being a Florida senator.

Rubio's comments come as the Republican presidential primary field is in the early stages of taking shape. Former Minnesota Gov. Tim Pawlenty has announced plans to form an exploratory committee, and Minnesota Rep. Michele Bachmann has said she will decide this summer whether to form one.

Other Republicans who have shown a strong interest in running include former Arkansas Gov. Mike Huckabee, Mississippi Gov. Haley Barbour, former House Speaker Newt Gingrich (Ga.) and former Massachusetts Gov. Mitt Romney.