"Which one do you trust, Vladimir Putin or the "intelligence community"?" Neither, and nor should you. Although Putin never said that there were weapons of destruction in Iraq.
The Republican Establishment knows that it can bide its time. If not in 2020, then certainly in 2024, the nominee will be one of its own. There's only one Donald Trump. There'll never be another.
Whereas the Democratic Establishment is in the full hysteria of those who know that they have lost. Between whatever ghastly old Clinton courtier they put up, and a very left-wing candidate indeed who would have been unimaginable before Bernie Sanders, then Sanders could have the 2020 nomination sewn up as the middle-of-the-road option.
In any event, that courtier will certainly not be the nominee. And the whole court knows it.