The AP article [1] has the full complaint linked, the crux of the case seems to be around the judge allowing the defendant to leave through a back entrance ("jury door") when they were aware agents were waiting in the public hallway to make an arrest as they exited.
" 29. Multiple witnesses have described their observations after Judge DUGAN returned to her courtroom after directing members of the arrest team to the Chief Judge’s office. For example, the courtroom deputy recalled that upon the courtroom deputy’s return to the courtroom,defense counsel for Flores-Ruiz was talking to the clerk, and Flores-Ruiz was seated in the jury box, rather than in the gallery. The courtroom deputy believed that counsel and the clerk were having an off-the-record conversation to pick the next court date. Defense counsel and Flores-Ruizthen walked toward each other and toward the public courtroom exit. The courtroom deputy then saw Judge DUGAN get up and heard Judge DUGAN say something like “Wait, come with me.” Despite having been advised of the administrative warrant for the arrest of Flores-Ruiz, Judge DUGAN then escorted Flores-Ruiz and his counsel out of the courtroom through the “jury door,” which leads to a nonpublic area of the courthouse. These events were also unusual for two reasons.First, the courtroom deputy had previously heard Judge DUGAN direct people not to sit in the jury box because it was exclusively for the jury’s use. Second, according to the courtroom deputy, only deputies, juries, court staff, and in-custody defendants being escorted by deputies used the back jury door. Defense attorneys and defendants who were not in custody never used the jury door."
" 29. Multiple witnesses have described their observations after Judge DUGAN returned to her courtroom after directing members of the arrest team to the Chief Judge’s office. For example, the courtroom deputy recalled that upon the courtroom deputy’s return to the courtroom,defense counsel for Flores-Ruiz was talking to the clerk, and Flores-Ruiz was seated in the jury box, rather than in the gallery. The courtroom deputy believed that counsel and the clerk were having an off-the-record conversation to pick the next court date. Defense counsel and Flores-Ruizthen walked toward each other and toward the public courtroom exit. The courtroom deputy then saw Judge DUGAN get up and heard Judge DUGAN say something like “Wait, come with me.” Despite having been advised of the administrative warrant for the arrest of Flores-Ruiz, Judge DUGAN then escorted Flores-Ruiz and his counsel out of the courtroom through the “jury door,” which leads to a nonpublic area of the courthouse. These events were also unusual for two reasons.First, the courtroom deputy had previously heard Judge DUGAN direct people not to sit in the jury box because it was exclusively for the jury’s use. Second, according to the courtroom deputy, only deputies, juries, court staff, and in-custody defendants being escorted by deputies used the back jury door. Defense attorneys and defendants who were not in custody never used the jury door."
[1]: https://apnews.com/article/immigration-judge-arrested-799718...