Trump rallies his base as Biden preps for debate

President Donald Trump held a rally in Virginia despite state health officials warning it posed a "significant health risk."
3:05 | 09/26/20

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Transcript for Trump rallies his base as Biden preps for debate
It would take four Republicans to break ranks to stop it. Now to the race to white house. President trump holding a rally overnight in Virginia despite health officials say it would prove unsafe. ABC's Rachel Scott is in Washington with the latest on the campaign trail. Good morning. Reporter: Good morning, we are just hours away from president trump announcing his supreme court pick. The president in an all out campaign blitz hitting six battleground states this week, continuing to dig into those unfounded claims that mail-in voting will lead to widespread voter fraud and without evidence claiming that the election could be rigged against him. Overnight, president trump packing in events. On the campaign trail in Virginia. Now they're talking about tens of millions of these fake ballots going all over the place. Who's sending them? Where are they being sent? Who's sending them back? Reporter: In Georgia once again pushing baseless claims that mail-in voting leads to We may end up in a dispute for a long time because that's the way they want it, but we're going to end up winning, that's for sure. Reporter: A day earlier his hand picked FBI director said there's no evidence to support that claim. We have not seen historically any kind of coordinated national voter fraud effort in a major election. Whether it's by mail or otherwise. And in a rare move, the white house chief of staff fired back. Well, with all due respect to director WRAY, he has a hard time finding emails in his own FBI, let alone figuring out whether there's any kind of voter fraud. Perhaps he needs to get involved on the ground and he would change his testimony on capitol hill. Reporter: In 2016, president trump won 9 of the 16 states where the majority of voters voted by mail. This year, at least 30 states plus Washington, D.C. Have made changes to make it easier and more accessible to vote from home. Multiple studies and election experts have found voter fraud to be extremely rare. Elections are a very controlled and deliberate process with laws that have safeguards throughout to protect voters and to make sure that our tally is accurate, to make sure that there's integrity in our voting process. Reporter: President trump now telling his supporters in Virginia if he loses, he wants a smooth transition of power but only if it's an honest vote. His rival Joe Biden labeling it all a distraction. The American people aren't going to be shut down in this election. Every vote in this country is going to be heard, and they will not be stopped. Reporter: And we are just days out from the first presidential debate. We're told Joe Biden is expected to keep a light schedule as he begins heavily preparing for that debate. Sources tell us that president trump is expected to meet with his advisers this week to discuss the debate, though he will be leaning more heavily on his experience over the last four years as preparation for the big night. Janai? Rachel, looking ahead to Tuesday, and we will have complete coverage of the first presidential debate Tuesday night starting at 8:00 eastern here on ABC.

This transcript has been automatically generated and may not be 100% accurate.

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