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Is this the first official Twitter fight of 2016?

Kentucky Sen. Rand Paul, a prospective Republican presidential candidate, is ripping his fellow senator and presidential contender, Marco Rubio (R-Florida), over his support for the U.S. embargo on Cuba.

The dispute is evidence of a growing divide within the Republican Party over Cuba as potential presidential candidates come closer to announcing their bids.

Paul on Thursday said the embargo on Cuba "just hasn't worked" and that opening up trade relations with the communist nation is "probably a good idea." That didn't please Rubio. The Cuban-American senator said on Fox News Thursday night that Paul "has no idea what he's talking about" when it comes to U.S.-Cuba relations.

The Kentucky senator shot back on Friday with a Facebook post pointing out the U.S. trades with communist countries like China and Vietnam and accusing Rubio of "acting like an isolationist who wants to retreat to our borders and perhaps build a moat."

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In case Rubio hasn't been checking Facebook, Paul went after him on Twitter too.

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Rubio hasn't responded yet on his Twitter account.

Jordan Fabian is Fusion's politics editor, writing about campaigns, Congress, immigration, and more. When he's not working, you can find him at the ice rink or at home with his wife, Melissa.