In an interview on Fox Business Network, Trump explicitly noted two funding provisions that Democrats are seeking in a relief package that has stalled on Capitol Hill. Without the additional money, he said, the Postal Service won't have the resources to handle a flood of ballots from voters who are seeking to avoid polling places during the coronavirus pandemic.

“If we don’t make a deal, that means they don’t get the money,” Trump told host Maria Bartiromo on Thursday. “That means they can’t have universal mail-in voting; they just can’t have it.”

https://www.tampabay.com/florida-politics/buzz/2020/08/14/tr...

Agree or not, Trump's claim is that mail voting undermines integrity. And whether he's theoretically correct or not, honest or not, the first evidence from Paterson NJ showed that mail-in voting spoiled every vote for council. The number of ruined ballots was greater than the margin of victory. People are calling it a "win" because some of the fraudsters (or misguided people accidentally violating electionaw) were arrested, but that doesn't unspoil the vote.