The disagreement between Sens. Marco Rubio (R-FL) and Rand Paul (R-KY) over America's changing relationship with Cuba is escalating quickly.
Rubio was among the loudest opponents to President Barack Obama's announcement that the United States would begin normalizing relations with its Caribbean neighbor. After Paul said he supported the change, Rubio lashed out, saying Paul "has no idea what he's talking about."
Both are considered potential 2016 presidential contenders, and Paul struck back on Friday on both Twitter and Facebook.