Trump is reflexively rejecting all evidence that undermines his own official claims about the nuclear deal, North Korea, and many other things, and he is doing that because the evidence proves his claims to be false.
Timereports on Trump’s unwillingness or inability to consider evidence that contradicts what he thinks he knows about foreign policy issues:
Trump’s lack of knowledge and dismal understanding of major issues have always been some of his biggest weaknesses, but the problem here is even worse than that. The president is not merely ignorant and unfamiliar with the relevant issues. We have known that all along. According to this report, he is determined to remain ignorant and fixed in his mistaken views about a wide range of issues, and the officials serving under him are enabling this so that they don’t make him angry at them. The point isn’t that intelligence agencies get everything right (they don’t), but on the issues where the president has publicly differed from their assessments he is consistently getting things wrong because that makes it easier for him to pretend that his policies are succeeding when everyone else can see that they aren’t.