Roger Stone lied to Congress, threatened a witness to cover his tracks, and will now serve 40 months in prison. President Trump has hinted he might pardon his longtime associate, but doing so would be a mistake.

Stone represents the corruption Trump promised to root out of Washington, D.C. He openly bragged about speaking with WikiLeaks founder Julian Assange to spread smears about Hillary Clinton, then lied about the Trump campaign’s knowledge of these encounters. Stone then tried to prevent a witness from accurately testifying.