Pras Michel has his game face on as his federal conspiracy case kicks into high gear in Washington D.C., with some huge names -- including Leonardo DiCaprio -- set to take the stand.
We caught The Fugees rapper just as he arrived at the courthouse with his defense lawyer ... ahead of what could be a crucial day. Leo is a key witness, and he testified Monday morning after the court allowed him to use a side entrance to avoid the media.
TMZ Hip Hop broke the story back in October ... Leo is just one of the many high-profile witnesses who could take the stand before it's all said and done.
Former U.S. Presidents Barack Obama and Donald Trump, and ex-U.S. Attorney General Jeff Sessions are all named on the defense's witness list in the saga.
Pras is facing 22 years for his alleged role in a money laundering scheme with Malaysian fugitive Jho Low ... where Low's accused of acting as an agent for the Chinese government.
Leo's not a defendant, but he's been subpoenaed because the feds claim he's one of several celebs who received gifts from Low.
Leo is still testifying as of this post -- we'll keep you updated as the trial progresses.