It is coming in the 2018 midterms.
That will be too late IMO.
Trump is being increasingly isolated by the Uniparty and the deep state. He needs to demonstrate power and instill fear in his enemies. His strength is his citizen base and he needs to turn them out in millions to show the enemies of America what he can do. Millions of aggressive marchers in Washington would be a start. He has a rally scheduled for next week. He needs to reach past the media and the politicians and mobilize his supporters for what is to come.