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Show by car who you support is something both supporters of Donald Trump and supporters of Joe Biden are currently doing.
So far, so harmless.
On Friday, however, it became dangerous: According to the Biden team in Texas, some Trump fans surrounded a Democratic campaign bus with their cars, pressed them and rammed an escort vehicle.
Now the FBI is investigating.
For the US President, an absurdity - not the incident, but the investigation by the Federal Police.
He wrote on Twitter: The "Patriots did nothing wrong".
During a campaign appearance in Florida, Trump downplayed the sensitive incident again on Sunday.
Donald Trump, US President
"They were driving on the highway and there was the Sleepy Joe's bus. So they escorted the bus. And now the radical left is saying, Oh, what a terrible thing, they escorted the bus."
Neither Joe Biden nor his runner-up, Kamala Harris, were on the campaign bus.
After the incident, the Biden campaign canceled two events in Texas.
The Democratic candidate spoke out in Pennsylvania on Sunday.
Joe Biden, Presidential Candidate
"There's never been anything like it. At least we've never had a president who approved of something like this. Folks, we're not like that. We're much better than that."
Donald Trump tweeted a video of his supporters' SUVs and the Biden bus right after the incident, with the words "I love Texas".
Critics accuse Trump of indirectly calling on his supporters to take further actions of this kind with such statements.
According to polls, Biden and Trump are in an unexpected head-to-head race in Texas.
The state was previously a stronghold of the Republicans.