(CNN) - If he had to do it again, he would wear a different pair of shoes.
That's one of the lessons Sen. Rand Paul took away from his nearly 13-hour filibuster on Wednesday that lasted late into the night. As he told CNN Chief Congressional Correspondent Dana Bash in his first television interview after the exercise in oratory, "We had no plan and I had the wrong shoes on, my feet were hurting the whole day."
Paul, a Texas Republican, penned an op-ed for The Washington Post on Saturday and further explained the goal behind his marathon session on the floor of the Senate.
"I wanted to sound an alarm bell from coast to coast," he said. "I wanted everybody to know that our Constitution is precious and that no American should be killed by a drone without first being charged with a crime. As Americans, we have fought long and hard for the Bill of Rights. The idea that no person shall be held without due process, and that no person shall be held for a capital offense without being indicted, is a founding American principle and a basic right."
He led an actual filibuster on the Senate floor, preventing the body from considering any other business - had it been interested in doing so - by speaking from just before noon until about 12:30 a.m. on Thursday.
Later that day, he received an answer to his question from the Obama administration.
"It has come to my attention that you have now asked an additional question: 'Does the President have the authority to use a weaponized drone to kill an American not engaged in combat on American soil?'" Attorney General Eric Holder wrote. "The answer to that question is no."
In the op-ed, Paul thanked the Republicans in the Senate and House - including the "conservative cavalry" of congressmen - who came to his aid by asking questions which relieved him of the need to speak constantly through the entire filibuster.
And he recalled one moment which he described as unforgettable - when Sen. Mark Kirk, R-Illinois, brought him some refreshment.
"I was not allowed to drink anything but water or eat anything but the candy left in our Senate desks," Paul wrote. "But he brought me an apple and a thermos full of tea - the same sustenance Jimmy Stewart brought to the Senate floor in the movie 'Mr. Smith Goes to Washington.'"