"He did not keep his side," John Dowd told CNN on Saturday.
Dowd defended his attempt to have a good relationship with Mueller at the beginning because of what he called the importance of a "confidence factor" as a way of "trying to do more."
"They told us the documents They said we were, that's them, "he said. "It was a total, wide-open collaboration."
Dowd initially urged the President to cooperate with Mueller's probe and fight back to publicly attack him. He and Trump's other lawyers later advised Trump not to sit down for an interview with the Special Adviser, as he and his colleagues argued that you could not treat the president like any other because he was the CEO. Rudy Giuliani, one of Trump's current attorneys, has also said he does not think the president should sit in for a job interview.
Mueller's team has told Trump's attorneys that there are certain areas where they feel they should question the president as part of their investigation.
Does Trump want to testify? As CNN has already reported, his enthusiasm for the house, office and hotel room of his former personal attorney Michael Cohen has dropped. Dowd points out: "The president must take the position he wants to testify politically, but the real point here is, should he, is it justified by the facts?"
All in all, Dowd criticized the process. "That should never have happened, we do not treat this process like a political game, that's the president."
In view of Trump 's attacks on the Mueller probe and the declining approval ratings for special adviser Dowd, Mueller has no political support, and the president has no way. He should just move on.
When the new Legal Department issues new demands to the Special Council team to approve an interview, as the New York Times reported on Friday, Dowd said, "You (the special adviser) have the ball. … You must show that there is a crime. "
If there is no voluntary interview and Mueller decides to seek a summons against Trump, Dowd predicts that it may be blocked.
"If he tries to use that and get a grand jury, what will he tell the judge? He has everything."
Dowd also said that he would argue that the Special Counsel's team said Trump was not a target.
"We have answered all these questions, why are we wasting the time of judgment?" he said. "When all is said and done, the President is a witness and not a target."
CNN's Kevin Bohn, Jeremy Diamond, Pamela Brown and Eli Watkins contributed to this report.