Any "proof". Barr is now denying McSwain's contentions in an interview to the WaPo:
"Barr said McSwain told him in their phone call that his reference to a “directive” involved a single matter having to do with “allegations of irregularities” in Delaware County, Pa., and that the directive came in a conversation with Richard Donoghue, a senior Justice Department official."
William Barr clashes with former Trump appointee from Pa. over handling of election-fraud claims Barr is accusing McSwain of grandstanding because he wants MAGA support for his run for governor.