The CIA/NSA dirt on him.
They have the details on his wife’s shipping company. Seems like there was some controversy with it.
Before the Ping May, a rusty cargo vessel, could disembark from the port of Santa Marta en route to the Netherlands in late August, Colombian inspectors boarded the boat and made a discovery. Hidden in the ship’s chain locker, amidst its load of coal bound for Europe, were approximately 40 kilograms, or about ninety pounds, of cocaine. A Colombian Coast Guard official told The Nation that there is an ongoing investigation.
https://www.thenation.com/article/mitch-mcconnells-freighted-ties-shadowy-shipping-company/