Joe Biden’s campaign canceled a fundraiser that it had scheduled with a top lawyer from special counsel Robert Mueller’s investigation into Russian interference in the 2016 election.

Andrew Weissmann, a former Department of Justice lawyer who had the second-most senior position on the Mueller team, was scheduled to host a “fireside chat” for a June 2 event benefiting the former vice president and presumptive Democratic presidential nominee. But according to the Wall Street Journal, the event was canceled shortly after it was planned.