A political opponent of Sen. Elizabeth Warren brought a federal complaint Sunday in defense of his right to make the Democrat’s heritage the chief focus of his election campaign.

Represented by the firm Cornell Dolan, biomedical engineer Shiva Ayyadurai says the city of Cambridge has threatened him with $300-a-day fines over the campaign bus he keeps parked in a lot at 701 Concord Ave.

Read the full article at the Courthouse News Service website.