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Nati Harnik, Associated Press
Republican presidential candidate, Sen. Marco Rubio, R-Fla., laughs while speaking at the Family Leadership Summit in Ames, Iowa, Saturday, July 18, 2015.

Florida Sen. Marco Rubio is aggressively refuting the notion that he lacks experience compared with others in the Republican presidential field.

The 44-year-old freshman senator argues that he best understands the challenges Americans face today. He says he understands having to live paycheck to paycheck and notes that until recently he had student loans payments.

Rubio admits some of the candidates have more experience "on the issues we faced 18 years ago, but no one running has more experience on the issues we face right now, today, in the 21st century."

Rubio was the first presidential candidate to address the daylong event. Nine more Republican prospects are scheduled to take the stage.