GEORGE STEPHANOPOULOS, ABC'S "THIS WEEK" HOST: I want to get to the debate between you and Rand Paul inside the Republican Party right now.
You guys got in something of a Twitter war over the course of this week on this issue of Cuba. The latest one from Rand Paul saying, "Senator Marco Rubio is acting like an isolationist who wants to retreat to our borders and perhaps build a moat. I reject this isolationism. This seems to be a preview of the debate of 2016."
SEN. MARCO RUBIO: Well, first of all, Rand, if he wants to become the chief cheerleader of Obama's foreign policy, he certainly has a right to do that.
I'm going to continue to oppose the Obama-Paul foreign policy on Cuba because I know it won't lead to freedom and liberty for the Cuban people, which is my sole interest here.
STEPHANOPOULOS: He's running hard for the nomination.
If he gets it, could you support Rand Paul and his foreign policy, if he were the Republican nominee?
RUBIO: Well, I anticipate -- I anticipate supporting whoever the Republican nominee is and I'm pretty confident that the Republican nominee for president will be someone who has a pretty forceful role -- view of America's role in the world as a defender of democracy and of freedom and also understands that it's important for America to be engaged on the global stage.