Rubio argued that Clinton is "extremely vulnerable in her record" because of the foreign policy "failures" of the Obama administration.
Rubio, like Clinton, is a possible candidate for president.
It's not the first time Rubio has made the "20th century"" argument. He said something similar in New Hampshire in May, though he did not mention Clinton by name. Democrats, Rubio said then, could "nominate someone now who wants to take us to the past, to an era that is gone and is never coming back. The 20th century is gone. We live in the 21st century, a time of extraordinary challenges but also extraordinary opportunities."
Adrienne Elrod, communications director for Correct the Record, a pro-Clinton super PAC, responded in a statement: "Should she decide to run for president, Hillary Clinton would present a forward-thinking agenda, one that presents new, bold ideas to keep our country moving in the right direction."