Ron Paul Warns Rand: You Could Win in 2016

Tell Leno he has not discussed a presidential run with his son

Former Rep. Ron Paul has some advice for his son, Sen. Rand Paul, if he decides to run for president: Be careful.

But it might not be why you'd think.

"I would say be very cautious, you could get elected," the elder Paul, a Texas Republican, joked on "The Tonight Show" on Thursday night.