The 2016 presidential campaign is already heating up, even though the actual election is two years away, and another Republican has added his name to the list of hopefuls.

During the last presidential election, there was talk of Florida Senator Marco Rubio as a possible contender for vice president, as Mitt Romney's running mate. He, after all, would have helped Republicans appeal to Latinos. Yet, it was not meant to be and Romney chose Paul Ryan. Still, the speculation garnered Rubio national name recognition.

But he capitalized on it poorly. Rubio's bumbling rebuttal to the State of the Union in 2013 tarnished his rising star. His stance in favor of immigration reform and position as a member of the Gang of Eight initially won him accolades from Democrats and moderate Republicans, however, his shift to the right in the later half of 2013 was not received well by immigration reform activists. Yet, now the senator feels sure he can woo the country enough to be elected president.

On ABC's Sunday morning show "This Week," hosted by Jonathan Karl, the 42-year-old freshman senator expressed his interest in the campaign. Karl asked him directly if he is ready to be president, and the senator responded in kind.

"I do ... but I think that's true for multiple other people that would want to run ... I mean, I'll be 43 this month, but the other thing that perhaps people don't realize, I've served now in public office for the better part of 14 years," said Rubio. "Most importantly, I think a president has to have a clear vision of where the country needs to go and clear ideas about how to get it there and I think we're very blessed in our party to have a number of people that fit that criteria."

Along with his desire to run for president, Rubio made comments about climate change and former Secretary of State Hillary Clinton. Despite the release of a new Obama administration report that states humans are responsible for global climate change, Rubio said, "I do not believe that human activity is causing these dramatic changes to our climate the way these scientists are portraying it, and I do not believe that the laws that they propose we pass will do anything about it, except it will destroy our economy " according to excerpts released by "This Week."

Regarding Clinton, Rubio told Karl he would give her an F as Secretary of State.