As the Wisconsin Senate race comes down to the wire, outside groups from both sides are pouring in millions in advertising, The Associated Press reported.

Let America Work, a group supporting incumbent Republican Sen. Ron Johnson, released an ad Monday that said “enough of the crap.” Literally.

“That’s why we need Ron Johnson,” the ad says. “To cut the crap and keep Hillary Clinton and the Washington politicians from running wild.”

At the same time, the Senate Majority PAC, which backs Democratic Senate candidates, spent $2 million on an ad on behalf of Johnson’s challenger, former Sen. Russ Feingold. The spot accuses the incumbent of working primarily for Wall Street instead of for the interests of Wisconsinites.

[Senate Democratic Super PAC Spends Big on Feingold in Wisconsin]

Johnson has long been considered one of the most vulnerable Republican Senate incumbents and has trailed in most polls.

The spending spree comes as Democratic vice presidential candidate Sen. Tim Kaine is slated to campaign in Wisconsin on Tuesday — the same day as GOP presidential nominee Donald Trump and his running mate, Gov. Mike Pence of Indiana.

House Speaker Paul D. Ryan is also supposed to campaign for Johnson in their home state.

The Rothenberg & Gonzales Political Report/Roll Call rates the race as Leans Democratic.