A federal trial is set to begin Monday over claims that supporters of former President Donald Trump threatened and harassed a Biden-Harris campaign bus in Texas four years ago, disrupting the campaign on the last day of early voting.

The civil trial over the so-called “Trump Train” comes as Trump and Vice President Kamala Harris race into the final two months of their head-to-head fight for the White House in November.

Democrats on the bus said they feared for their lives as Trump supporters in dozens of trucks and cars nearly caused collisions, harassing their convoy for more than 90 minutes, hitting a Biden-Harris campaign staffer’s car and forcing the bus driver to repeatedly swerve for safety.

The lawsuit names six defendants, accusing them of violating the “Ku Klux Klan Act,” an 1871 federal law to stop political violence and intimidation tactics.