A congressional hearing on the Clinton Foundation turned into a fiasco on Thursday after Republicans clashed with their own witnesses — two private investigators who refused to turn over documents that they claimed showed evidence of criminal wrongdoing at the Clinton Foundation.

John Moynihan and Larry Doyle, financial analysts who say they have uncovered evidence of pay-to-play and financial crimes at the Clinton Foundation, were invited to testify on their findings by the House Oversight Committee’s Republican Chairman Mark Meadows.