OK well I watched the whole tape and didn’t hear Trump call Bush a liar. He may as a private citizen years ago have called Bush a liar I don’t know, but I don’t think that’s what he’s been saying since he started running for office.
The Bush administration lied in terms of misrepresentation because there was no certainty about the WMD’s still being there. But I doubt Bush ever actually said himself that WMD’s were there and were the reason for the invasion.
He is still a private citizen.