Timothy Mellon, Secretive Donor, Gives $50 Million to Pro-Trump Group

Timothy Mellon, a reclusive heir to a Gilded Age fortune, donated $50 million to a super PAC supporting Donald J. Trump the day after the former president was convicted of 34 felonies, according to new federal filings, an enormous gift that is among the largest single disclosed contributions ever.

The donation’s impact on the 2024 race is expected to be felt almost immediately. Within days of the contribution, the pro-Trump super PAC, Make America Great Again Inc., said in a memo that it would begin reserving $100 million in advertising through Labor Day.

The group had only $34.5 million on hand at the end of April, and Mr. Mellon’s contribution accounted for much of the nearly $70 million that the super PAC raised in May. On Wednesday and Thursday, the super PAC began reserving $30 million in ads to air in Georgia and Pennsylvania around the Fourth of July holiday.

Mr. Mellon is now the first donor to give $100 million in disclosed federal contributions in this year’s election. He was already the single largest contributor to super PACs supporting both Mr. Trump and Robert F. Kennedy Jr., who is running as an independent. Mr. Mellon has previously given $25 million to both.

Democrats have sought to portray Mr. Kennedy as a spoiler supported by Republicans, in part by emphasizing Mr. Mellon’s dual contributions and seemingly split loyalties. The pro-Kennedy super PAC has distributed quotations from the hard-to-reach Mr. Mellon, and for a blurb that appears on the cover of Mr. Mellon’s upcoming book, Mr. Kennedy called the billionaire a “maverick entrepreneur.”

It is not clear what Mr. Mellon’s mega-donation means for his support of Mr. Kennedy going forward. He has so far toggled between giving to support both candidates. His most recent donation to Mr. Kennedy’s super PAC was a $5 million contribution in April.