According to the arrest report received by a local radio station, when police pulled over the defendant, they discovered an open can of beer inside his car.
The unidentified 55-year-old driver was arrested for driving under the influence following a field sobriety test.
Alongside former Republican congressman Liz Cheney, Democratic presidential hopeful Harris was in the Wisconsin town of Brookfield for a campaign event.
Officers spotted a male in an SUV traveling west in the eastbound lane of Interstate 94 just before 20:30 local time (01:30 GMT), according to the Milwaukee County Sheriff’s office.
When the driver got close to the vice-president’s motorcade, he was halted.
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The individual was “extremely surprised and had no recollection of entering the freeway” when a deputy informed him that he had “almost struck a vehicle in the VPOTUS’ motorcade,” according to an arrest report that local news station WISN was able to get.
The individual reportedly failed a number of field sobriety tests.
The event did not result in any reported injuries.