The Trump-appointed chief of the United States Postal Service (USPS) was interrogated on Capitol Hill on Monday about his Republican super PAC ties, which were first surfaced by a TMI investigation. At the same time, new documents showed that the GOP takeover of the agency coincided with a significant slowdown in mail delivery just months before the November election.

Under harsh questioning from Rep. Raja Krishnamoorthi, USPS Board of Governors chairman Robert Duncan confirmed that, while leading the postal service, he has also been serving on the board of two Republican super PACs aiming to tilt the 2020 election. One of the super PACs is working to keep the Senate in Republican hands, and the other has spent nearly $1.9 million to support President Donald Trump’s reelection. Krishnamoorthi also flagged that Duncan’s postal service bio boasts of his fundraising efforts when he served as chairman of the Republican National Committee.

Last week, the top Republican on the House Oversight and Reform Committee suggested that postal service delays aren’t actually happening, and that any slowdowns that may occur have nothing to do with the appointment of Trump donor Louis DeJoy as postmaster general.