"I am doing fabulous," Cruz replied. "I am encouraged; I'm inspired; I'm motivated by the American people right now."
Roberts said he appreciated how Cruz conducted himself throughout the night, especially after a few Senate Democrats came to the floor to throw "arrows and slings."
"If you're about ready to sit down, I'd be happy to buy you breakfast," Roberts added.
Cruz did not indicate he would stop anytime soon, and other Republican senators were tweeting that they would return to the Senate to help Cruz Wednesday morning.