The electorate has multiple choices, the Kentucky Republican stressed.
“I don’t think people ought to worry about their vote not counting,” he said. "And I would encourage people: They’ve got three options in Kentucky. You can vote early, you can vote on Election Day, or you can drop it in the mail."
“So I would encourage people not to worry about your vote not counting," he added. "Choose which option is the best for you, but be sure and vote."
Voting by mail has become a contentious political issue over the past couple of months.
President Trump has attacked mail-in voting as rife with fraud, while providing no evidence, and there are escalating concerns about the ability of the U.S. Postal Service to handle an expected record number of mailed ballots.
Jordan Smellie moves absentee ballots to be counted at City Hall in Garden City, Mich. (AP Photo/Paul Sancya, File)
Although access varies by state — with some mailing ballot to every registered resident and others requiring voters to retrieve ballots themselves — the Postal Service is facing serious questions about its ability to deliver ballots on time.
In July, Postal Service General Counsel Thomas Marshall reportedly told a top Michigan election official about a "significant risk that the voter will not have sufficient time to complete and mail the completed ballot back to election officials in time for it to arrive by the state’s return deadline."
While Postmaster General Louis DeJoy did not deny the organization's finances are "dire," he has promised that it has “ample capacity to deliver all election mail securely and on time" even with the significant increase in mail-in ballots expected due to coronavirus fears.
Despite the uncertainty, McConnell maintained Friday that the Postal Service "can handle this."
Voting twice is illegal.
“Sign your mail-in ballot, OK? You sign it and send it in and then you have to follow it. And if on Election Day or early voting, that is not tabulated and counted, you go vote,” he said. “And if for some reason after that — it shouldn’t take that long — they’re not going to be able to tabulate it because you would have voted.”
“But you have to make sure your vote counts, because the only way they are going to be able to beat us is by doing that kind of stuff,” Trump added.
McConnell, who is running for reelection this year, said he supported giving the agency an additional $10 billion to ensure its election-related deliveries are handled properly.
Fox News’ Samuel Dorman and The Associated Press contributed to this report.