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“The 50-year embargo just hasn't worked,” Sen. Rand Paul (R-Ky.) told a radio show  Thursday. Later in the interview, he said, “In the end, I think, probably, opening up Cuba is probably a good idea."

Sen. Marco Rubio (R-Fla.) does not agree with him. “I don’t care if the polls say that 99 percent of people believe we should normalize relations in Cuba," he told Fox News on Wednesday. "I don’t care if 99 percent of people in polls disagree with my position. This is my position, and I feel passionately about it."

A day later, he addressed Rand Paul's position head on, again, on Fox News“Like many people who have been opining, he has no idea what he’s talking about.”

Paul, of course, could not let the insult go unanswered, and began tweeting at @marcorubio.

The joke here? Sen. Paul is usually the elected official most likely to be accused of being an isolationist.

The Internet watched and reached one conclusion. Rand Paul is preparing to be 2016's Twitter troll.

It's exciting to see the potential presidential candidates working on building their #brand so early in the game. We can only imagine that the content created by 2016 contenders is going to be the greatest we have ever seen!