Rand Paul launches tirade against Rubio over Cuba

Kentucky Sen. Rand Paul disagrees with his Republican colleague, Florida Sen. Marco Rubio, over the Obama administration's easing of relations with Cuba—pretty vehemently, in fact.

Paul took to Twitter Friday to challenge Rubio on his stance against the new Cuba policy.

(Rubio, among other things, has said he would block any ambassador nominee to the island nation).

It was a rare, heated public spat between two prominent Republicans, both mentioned as possible presidential candidates in 2016.

Rubio, who has not posted on Twitter since the Cuba policy change, did not immediately respond to Paul's charges.