The Progressive Democrats are plainly obsessed with a need to delegitimize Trump because they have never been able to accept the fact he won the election. No amount of proof, or conversely, lack of evidence will ever suffice to change their made-up minds.
They had plans. They had control of the educational establishment, the news media, the arts and entertainment world, the Federal bureaucracy. They had Hillary. They were going to finish the job that Bill Clinton started, and that Obama had moved far along toward completion: the fundamental transformation of America from a constitutional Federal Republic with secure borders to a borderless popular People's Democracy within a globalized international government.
When on Election Day 2016 those plans came to a screeching halt, the Progressives' smug certainty was replaced with a toxic potion of denial, cognitive dissonance, petulance and rage. As all true ideologues tend to do, they looked not inward for answers as to why they had lost, but outward for scapegoats and villains to blame.
And not coincidentally: they turned hard to the Left, whose identity politics and well-worn catechism of presumptive Oppressors and approved Victims served as a ready template to define the terms of the battles to come.
In certain respects, Donald Trump is an easy target: he is brash, undisciplined, poorly-mannered and easily provoked. But nonetheless, he has been successful in thwarting the Left's schemes in important ways: implementing tax reform, putting conservatives jurists on the Federal bench, removing bureaucratic impediments to economic growth and development, promoting American energy self-sufficiency, and (at least) moving toward restrictions on illegal immigration.
All of this drives the Progressive Left stark, raving mad.
And that is nothing but good for anyone who values liberty, property rights and a return to limited, constitutional governance.