During a trip to North Carolina on Wednesday, U.S. President Donald Trump encouraged those who vote by mail to cast two ballots in November's election, one by mail and another in person as a check to see if the mailed vote was counted. “They'll go out and they'll vote and they're going to have to go and check their vote by going to the poll and voting that way because if it tabulates then they won’t be able to do that. So, let them send it in and let them go vote,” Trump said in an interview with WECT-TV at the Wilmington airport. “And if their system's as good as they say it is, then obviously they won’t be able to vote. If it isn’t tabulated, they'll be able to vote. So that’s the way it is, and that’s what they should do.” Trump made a similar appeal in remarks to supporters at the airport. “You can’t let them take your vote away; these people are playing dirty politics - dirty politics. So if you have an absentee ballot or, as I call it, a solicited ballot ... you send it in, but I would check it, in any event, I would go and follow it and go vote," he said. Trump won North Carolina by 3.6 percentage points in 2016, but polls are showing an extremely close race taking shape in a state that generates 15 electoral votes for its winner.