And with respect to his contentious relationship with Texas Sen. Ted Cruz, Trump appeared to release Cruz from the pledge as well.
"Honestly, he doesn't have to support me," Trump said. "I'm not asking for his support."
Cruz has dodged the question of whether the pledge still holds by insisting he will be the nominee. Though on Friday, in an apparent reference to Trump, Cruz said, "I don't make a habit out of supporting people who attack my wife and attack my family."
Ohio Gov. John Kasich, also appearing on the CNN town hall, hedged as well.
"I got to see what happens," he said. "If the nominee is somebody that I think is really hurting the country, and dividing the country, I can't stand behind them."
Kasich may have been speaking for all the candidates when he added, concerning the pledge first raised at last August's debate, "You know, frankly, all of us shouldn't have even answered that question."