This November’s race between incumbent Republican Sen. Joni Ernst and Democrat Theresa Greenfield is expected to be one of the most costly in U.S. Senate history.

National senatorial campaign committees already have reserved more than $35 million in television airtime in Iowa, according to Rollcall.com.

One of the early ads, which started airing less than two weeks after Greenfield won a five-way Democratic primary, is a 30-second commercial by the National Republican Senatorial Committee attacking Greenfield’s record as a businesswoman.

The NRSC claims in the ad:

“Greenfield’s failed homebuilding business ran up millions in debt.”

“Theresa Greenfield’s company was repeatedly sued by homeowners and banks for fraud, shoddy work and not making payments on time.”

“Rottlund Homes shut its doors” and “destroyed Iowa jobs.”

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This Fact Checker was researched and written by Erin Jordan and co-hosted by Molly Duffy and Sarah Watson.