You mean Trump's lie that he was going to repeal Obamacare and that his solution would be so easy and a thing of beauty? You're right, that was one of his worst.
Trumpcare didn't pass because it was GARBAGE nobody wanted. And Trump didn't try either. He only told Ryan to write something that could look like a win for HIM later on. He didn't even know what his own bill was about. Nor did he know what Obamacare was. He just used it as a talking point to win over voters who hated Obama no matter what. And where was the great dealmaker Trump? Why didn't he use his alleged dealmaking skills when he had the chance?
Besides, you can explain away ANY lie by saying, oh, he thought so at the time, that was the way he perceived it, he tried but others are to blame etc etc. The TRUTH is that Trump doesn't care about the truth. He keeps bullshitting and bullshitting and you morons believe his BS.