Trump is NOT under Criminal Investigation, as per Special Counsel, Mueller, has stated President Trump is not currently a target of his investigations, his election campaign is though and the associates involved during that period.
https://www.independent.co.uk/news/w...-a8287531.html
The above link was from April.
Talking of which, Manafort trial, Mueller is not bringing any evidence of collusion to his sentencing trial. (Probably because there is none).