Hunter Biden’s defense team took shots at David Weiss’s credibility in a court filing on Tuesday, arguing the special counsel has “gotten much wrong” since charging the first son last year with illegally purchasing a firearm.

Defense attorneys’ claims that Weiss has made mistakes came as part of their fight to obtain additional discovery in the case, and they could signal that the first son intends to chip away at Weiss’s credibility piece by piece as a strategy to undermine his prosecution.