"Kim Jong-un did a great service to himself and to his country by doing this. But those hostages came out, with respect, we didn’t pay for them," he said at an Indiana rally, Sputnik reported.
He reiterated that North Korea’s leader Kim did "the right thing," seen by Washington as a goodwill gesture ahead of the June 12 summit, adding the hostages "came out for nothing and the others came out for $1.8 billion in cash."
This appeared to refer to a prisoner swap negotiated by his predecessor, Barack Obama, in January 2016, in which the United States released seven Iranians in exchange for four US citizens held in Iran.
The swap coincided with a US payment of $1.8 Iranian funds that were frozen after the 1979 Islamic revolution. Then-presidential candidate Trump slammed the payment as ransom.