Marco Rubio Launches Presidential Bid at 'Generational Moment'

U.S. Sen. Marco Rubio, R-Fla., threw his hat in the ring on Monday, announcing that he will run for the Republican presidential nomination in 2016.

Rubio made it official on Monday, telling George Stephanopoulos from ABC News that he was entering the presidential race.

"I think this country's at a generational moment where it needs to decide not what party it wants in charge but what kind of country are we going to want to be moving forward," Rubio told Stephanopoulos. "I think the 21st century can be the American century, and I believe that I can lead this country in that direction. I can help lead it there from the Senate. I can lead it there as president.

Rubio joins U.S. Sen. Ted Cruz, R-Texas; former IRS Commissioner Mark Everson; and U.S. Sen. Rand Paul, R-Ky., as official candidates for the Republican nomination. Former U.S. Sec. of State Hillary Clinton announced on Sunday she was seeking the Democratic nomination.

Later on Monday, Rubio will hold an event at the Freedom Tower in Miami to kickoff the campaign.