Senatory Harry Reid was a guest at a Congressional Progressive Caucus meeting Wednesday. Rep. Alan Grayson disrupted the meeting to confront Reid about his support for an ongoing ethics investigation into Grayson’s alleged misdeeds in office.

The Hill reports Grayson turned on Sen. Reid saying, “Shame on you. It’s not true.” Reid, never one to back down from a fight, replied, “It is true and I want you to lose.”

Rep. Ellison, who was running the CPC meeting reportedly called out Grayson for the disruption. An unidentified source told the Hill all the Democrats were “appalled” at Grayson’s behavior adding, “It was embarrassing for him and embarrassing for us that he behaved that way.”

Later, Sen. Reid’s office released a brief statement about the encounter. It reads in part:

Senator Reid took the opportunity to express his low opinion of Congressman Grayson to his face and remind him that reason Senator Reid has said that Grayson is under ethics investigation and appears to be running a Cayman Islands hedge fund from his Congressional office in order to line his own pockets is because these things are true, as established by seventy-four pages’ worth of evidence from the Congressional Ethics Committee.

The 74-page report Sen. Reid alluded to was released last month by the Office of Congressional Ethics. The report found “substantial reason to believe” that Grayson had violated House rules in six distinct ways, including using his House office to campaign for the Senate. Grayson is competing to fill the seat vacated by Senator Marco Rubio. His campaign has claimed the entire investigation is a “witch hunt” intended to benefit his primary opponent Rep. Patrick Murphy.