The bus was traveling between San Antonio and Austin, Texas.

On Friday, when SUVs and pickup trucks flying Trump 2020 flags drove near and around it.

Neither Democratic presidential challenger Joe Biden nor his running mate, Senator Kamala Harris, were aboard the bus, though it was carrying campaign staff.

The Biden campaign says they called 911 and local law enforcement assisted the bus in reaching its destination.

President Trump took to Twitter in response to the FBI announcement, saying, In my opinion, these patriots did nothing wrong.

Earlier in the day, while campaigning in Philadelphia, Biden commented on the events.

We've never had anything like this.

At least we've never had a president who thinks it's a good thing.