Two South Florida businessmen who also happen to be Republican donors say they have explosive information about “widespread corruption involving Joe Biden, Hillary Clinton, American diplomats and Ukrainian officials.” The pair, Lev Parnas and Igor Fruman, are Ukrainian, and their claims have been championed by President Trump and some of his most loyal defenders. But according to some disgruntled former business partners, they’re nothing more than conmen.

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As the Daily Beast reported late last month, Giuliani tasked Parnas and Fruman with uncovering alleged evidence of Biden-related corruption, and the pair served as intermediaries between top Ukrainian officials and Giuliani. But their claims began to fall apart when a former Ukrainian prosecutor who met with Giuliani — thanks to Parnas and Fruman — said that claims of criminality by Joe Biden’s son, Hunter Biden, were not supported by any evidence.