Trump vs Biden: Mail in Voting
Who's your baby?

Check
There is no evidence that foreign countries have ever attempted to sabotage a U.S. election with paper ballots. In fact, it would be easier to hack into an electronic voting system than to physically distribute millions of fraudulent ballots inside the United States. Ballot-box robberies have not occurred in the United States since the contested election of 1888.
President Trump regularly votes by mail. Trump voted by mail during New York City’s mayoral election in 2017, cast an absentee ballot the following year, and again used a vote-by-mail ballot in Florida’s primary election in 2020.
Rates of mail-in voting fraud in the United States are extremely negligible (between 0.00004% and 0.0025%) as multiple U.S. electoral monitors have attested. The FBI described mail-in voting as “secure and convenient.”
The Case for Trump
Biden’s claim that President Trump said, “all mail-in ballots are fraudulent” is unsubstantiated.
In the run-up to the 2020 election, the California Republican Party admitted to placing more than 50 “official” drop boxes for ballots around the state, which state officials said was illegal and could lead to voter fraud.
For further reading...
https://www.snopes.com/fact-check/mail-in-ballot-voter-fraud/
https://www.factcheck.org/2020/06/trumps-shaky-warning-about-counterfeit-mail-in-ballots/
https://www.washingtonpost.com/politics/2020/09/11/trumps-fusillade-falsehoods-mail-voting/
https://www.snopes.com/fact-check/trump-ever-voted-by-mail/
https://www.nytimes.com/2020/10/12/us/politics/california-gop-drop-boxes.html