The complaint was hand-delivered to the FEC Friday morning. It alleges that Signature Special Event Services, owned by Grimes' father Jerry Lundergan, purchased a touring bus and then leased it to Grimes campaign at below market rates. Federal law bars companies from giving gifts to campaigns.
A spokeswoman for the Grimes campaign called the complaint a political stunt, and said their compliance experts have done their due diligence and that they stand by the rental agreement the campaign made.
The FEC dismissed a similar complaint in 2010 involving a campaign bus rented to Nevada Republican Senate candidate Sue Lowden by a campaign donor.