(MCT) WASHINGTON — Sen. Rand Paul, R-Ky., on Wednesday began a filibuster of President Barack Obama’s nominee to head the CIA, saying he would continue speaking from the floor of the Senate until he had guarantees that U.S. policy on the use of drones would not be applied to Americans on U.S. soil.

A rumored presidential hopeful in 2016, Paul began speaking at 11:47 a.m. and continued into the early evening. He was successful in at least delaying the vote on John Brennan’s nomination until Thursday or possibly later.