Federal prosecutors have admitted to missteps in the case of  Sen. Bob Menendez (D-NJ), who was found guilty of corruption-related charges this past summer.

The mistakes could jeopardize the verdicts in the case, giving the former New Jersey senator an opening to appeal or request a new trial. Prosecutors revealed their series of errors in a letter last month, in which they told the Southern District of New York they had inadvertently given the jury access to evidence a judge ruled jurors should not see.