I dunno man, he’s not doing himself any favors with this one. This is potentially causing post-election chaos and brings up memories of Jan 6 which turned off a lot of Republicans. He should just focus on winning and not sowing doubt for if he loses:

“UOCAVA voting systems have several measures in place to prevent fraud while ensuring eligible voters can participate. Here are some key methods used:

1. Voter verification:

- Voters must complete a Federal Post Card Application (FPCA) to register and request a ballot.

- The FPCA requires personal information like full name, date of birth, and Social Security number.

- Election officials verify this information against existing records.

2. Signature matching:

- Voters must sign their ballot envelope or a separate declaration.

- Officials compare this signature to the one on file from voter registration.

3. Unique identifiers:

- Each absentee ballot has a unique code or barcode.

- This prevents duplicate voting and allows for tracking.

4. Secure transmission:

- Many states use secure online portals for ballot requests and delivery.

- When ballots are mailed, they're often sent via expedited, trackable methods.

5. Witness requirements:

- Some states require a witness signature on the ballot envelope.

- This helps verify the voter's identity and that they voted without undue influence.

6. Affidavit of eligibility:

- Voters often must sign an affidavit declaring their eligibility to vote.

- False statements on this affidavit are subject to perjury laws.

7. Ballot tracking:

- Many states provide online systems where voters can track their ballot's status.

- This transparency helps prevent and detect potential fraud.

8. Post-election audits:

- States conduct various types of audits after elections.

- These can help detect any irregularities in absentee voting.

9. Federal oversight:

- The Federal Voting Assistance Program (FVAP) and the Department of Justice monitor UOCAVA voting.

- They can investigate and prosecute cases of fraud.

10. State-specific measures:

- Some states have additional security measures, like requiring copies of identification documents.

It's worth noting that studies have consistently shown that voter fraud, including in absentee voting, is extremely rare in U.S. elections. The challenge is often balancing security measures with ensuring eligible voters can easily cast their ballots from abroad.”