All Eyes on Trump and Tuesday’s Wisconsin Primary #OnlyTrump

Donald Trump tried to put a difficult week behind him on Monday as he neared Tuesday’s Republican presidential contest in Wisconsin, where he is campaigning from the unfamiliar position of underdog.

The Republican front-runner is at risk of losing the Midwestern state to U.S. Senator Ted Cruz of Texas, an outcome that would dent the New York billionaire’ s aura of inevitability and make it harder for him to win the 1,237 delegates needed for the party’s nomination for the Nov. 8 election.

On the Democratic side, U.S. Senator Bernie Sanders of Vermont is trying protect his lead over front-runner Hillary Clinton in opinion polls in Wisconsin and eke out another victory over the former secretary of state.

Trailing Cruz in the polls in Wisconsin, Trump spent the entire weekend campaigning in the state and planned to draw in his wife, Melania, on Monday. He stayed on message, telling supporters in West Allis, Wisconsin, on Sunday night that Cruz was a liar and a “dirty rotten cheater” who is weak on immigration and would cut Social Security benefits.

“Wisconsin is going to be such a big surprise on Tuesday. We are doing so well,” Trump said.

The New York real estate tycoon has won 20 presidential nominating contests and leads in the delegate count that will determine the Republican Party’s nominee. He trails Cruz by 10 percentage points in some Wisconsin polls.

A loss would add to Trump’s woes after his campaign was rocked last week by the fallout from his suggestion, which he later dialed back, that women be punished for getting abortions if the procedure is banned. Uncharacteristically, Trump also acknowledged that he made a mistake retweeting an attack on Cruz’s wife, according to the New York Times.

electionvoting_small All Eyes on Trump and Tuesday's Wisconsin Primary #OnlyTrump

He also drew fire last week for saying he would not rule out using nuclear weapons in Europe and that Japan and South Korea might need their own nuclear arsenals to ease the U.S. financial commitment to their security.

“Was this my best week? I guess not,” Trump told “Fox News Sunday.” But, he added: “I think I’m doing OK.”

Cruz was eager to capitalize on Trump’s missteps.

More Republicans are recognizing that “nominating Donald Trump would be a train wreck,” Cruz said on Sunday in Green Bay, Wisconsin.

Cruz faces difficulty in winning the delegates needed to secure the nomination, given that the next states to vote, including New York on April 19, are Trump-friendly territory.

Clinton is already eyeing New York, holding campaign stops there on Monday even as other candidates make their final pitches in Wisconsin.

“I’m absolutely confident I will be the nominee,” Clinton told ABC in an interview that aired on Monday as she and Sanders continued to spar over scheduling more debates.

Sanders adviser Tad Devine said the senator wanted another prime-time debate with Clinton.

“If we can continue to win, if he has a good day tomorrow, we’re going to make his case through New York all the way to California,” Devine told CNN.

Republicans Cruz and Ohio Governor John Kasich, who is third in the race, want to deny Trump enough delegates so that the nominee is determined at the Republican National Convention in July.

Over the weekend, Trump complained that Kasich was an irritant gobbling up some of the delegates Trump needs.

“The problem is he’s in the way of me, not Cruz,” Trump said.

Kasich, who has vowed to stay in the race, tweeted: “That’s not how our republic works, Donald. We’ll keep fighting until someone reaches a majority of delegates.”

On Monday, Republican National Committee strategist Sean Spicer said on CNN the party would “never tell any candidate to get in or out of the race.”