Fox then replayed video of Mulvaney's Thursday press conference, during which Wallace pointed out that Mulvaney listed three reasons, not the two he listed on Sunday, for why the aid had been withheld.
"You were asked specifically by Jonathan Karl was investigating Democrats one of the conditions for holding up the aid, was part of the quid pro quo, and you said 'it happens all the time,'" Wallace said, referring to the ABC reporter who had questioned Mulvaney on Thursday.
Mulvaney said Trump mentioned the investigations in passing, but the chief of staff then stuck to his position that corruption and ensuring that aid was provided by other countries were the reasons for the delayed aid.
Wallace then pressed Mulvaney again.
"You know, I hate to go through this, but you said what you said, and the fact is after that exchange with Jonathan Karl, you were asked another time why the aid was held up, what was the condition for the aid, and you didn't mention two conditions, you mentioned three conditions," Wallace said.
Wallace then showed video of Mulvaney saying "three issues for that" while holding up three countries during the Thursday press conference. The third issue cited by Mulvaney on Thursday was whether Ukraine was cooperating with an ongoing investigation by the Justice of Department.
The Justice Department has said the linking of Ukraine aid to its investigation was "news to us," according to a senior Justice official cited by Fox.
Mulvaney conceded that he could see how people took his comments "the wrong way" but again insisted he never used the words "quid pro quo."
He also said that the fact that the aid to Ukraine was eventually sent should "put the matter to bed."