Senate Democrats investigating Leonard Leo and other conservative activists over their ties to Supreme Court justices pocketed donations from a wealthy businessman bankrolling organizations behind the high court “ethics” campaign — including ProPublica.

Leo, co-chairman of the Federalist Society legal group, told Senate Judiciary Committee Democrats last week he would not comply with an “unlawful” subpoena from the panel, which has accused Republican-appointed Justices Clarence Thomas and Samuel Alito of harboring conflicts of interest in connection to their reported relationships with Leo, Republican billionaires Harlan Crow and Paul Singer, and others. But some lawmakers have their own financial ties that ethics experts say could open them up to an apparent conflict of interest, or, at a very minimum, public charges of hypocrisy. Sens. Sheldon Whitehouse (D-RI) and Jon Ossoff (D-GA), as well as other Democrats who have taken aim at right-of-center nonprofit groups connected to Leo, have accepted tens of thousands of dollars from a California philanthropist giving generously each year to influential left-wing foundations, Federal Election Commission filings show.