Republican presidential candidate Sen. Ted Cruz (R-Texas) greets supporters Sunday as he leaves a campaign event at the Florian Gardens in Eau Claire. Credit: Associated Press

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Madison— In the last day of campaigning in Wisconsin's GOP presidential primary, Texas Sen. Ted Cruz said that the U.S. Supreme Court's landmark abortion decision can and should be overturned and that states should be able to ban abortion even in cases of rape and incest.

In a town hall meeting moderated by Fox News host Megyn Kelly, Cruz said that the high court's 1973 decision in Roe v. Wade should not be considered settled law.

"I think it was a classic example of (judicial) activism," Cruz told Kelly here at the Masonic Temple.

States should be free to prohibit abortion in cases including rape and incest, said Cruz, who noted that he had been involved in prosecuting such crimes while serving as solicitor general under the Texas attorney general.

"Rape is a horrific crime against the humanity of a person...but at the same time as horrible as that crime is, I don't think it's the child's fault," Cruz said.

The Texas senator also said here Monday that only one of the current candidates could and should win at a potential contested GOP convention in July.

Cruz said if neither he nor real estate mogul Donald Trump win a majority of delegates before the convention, the Republican establishment shouldn't be able to hand the nomination to an outsider who didn't run or isn't a candidate now.

"It is nothing less than a pipe dream. It ain't going to happen," Cruz said, speaking to reporters before the town hall.

Trump appeared Sunday at a similar town hall event with Fox News host and Wisconsin native Greta Van Susteren as the billionaire fights for a state that the polls have seemingly promised to Cruz.

A veteran dealmaker, Trump has struggled as front-runner to seal an agreement with Republicans for the nomination and needs a win to quiet doubts. Cruz also craves a victory in Wisconsin, something he hopes would show the tide for Trump has crested and now is on the ebb.

Both men are campaigning hard Monday and contending with Ohio Gov. John Kasich, who is seeking to carry off a few delegates of his own.

In Milwaukee Sunday, Trump predicted an upset while visiting Miss Katie's Diner in Milwaukee, a longtime stop for politicians.

"I would tell you, I think this has the feel of a victory," Trump told reporters Sunday.

Also over the weekend, a white nationalist group flooded Wisconsin with robocalls supporting Trump.

The businessman "will respect all women and help preserve western civilization," the narrator says on the call. "If you vote for Donald Trump, he will be a fine president."

The call says it was paid for by William Johnson, "a farmer and a white nationalist" and mentions two groups affiliated with Johnson, the American Freedom Party and the American National super PAC.

Johnson said Monday he spent about $6,000 on the call, which went to all Wisconsin landlines starting Saturday. He provided his cell phone number at the end of the call and said he took "hundreds and hundreds of calls" — both positive and negative — in response to the robocall.

He said the reaction was not as negative as it has been in other states, largely because the message was less controversial and the script was read by someone with a "sweet, grandmotherly voice." The robocall makes only a brief mention about white nationalism, which Johnson said he felt was important.

"I want people to hear, to feel comfortable with, the term 'white nationalist,'" said Johnson, a Los Angeles lawyer and persimmon farmer.

Audio of the call was provided to the Milwaukee Journal Sentinel by Jerry Bader, a Green Bay radio host who opposes Trump and recently emceed an event for rival Ted Cruz. Two Democrats — one in Milwaukee and one in Madison —told the newspaper they also received the robocall.

Speaking to reporters after the town hall in Madison, Gov. Scott Walker, a Cruz supporter, denounced the robocall.

"That's outrageous. I hope the people of this state are smart enough to see through that and denounce anything related to it," Walker said.

As Walker joined Cruz on stage for the town hall, someone in the audience yelled that Cruz and Walker looked like president and vice president candidates. The governor told the audience that Cruz was the only conservative candidate who could defeat former secretary of state and Democratic contender Hillary Clinton in November.

The Democratic primary in Wisconsin is, if anything, even closer than the Republican race. Vermont Sen. Bernie Sanders is rallying supporters in Janesville, Green Bay and Milwaukee on Monday, and former President Bill Clinton is speaking to supporters of his wife on Monday afternoon at Turner Hall in Milwaukee.

"Our job is to think outside the box, to think outside the status quo, to ask the hard questions, like why not?" Sanders told a crowd of several thousand Sunday in Madison.

A poll Sunday showed Cruz and Sanders ahead but left space for doubts about the outcome of Tuesday's elections.

The survey by CBS News and YouGov showed Cruz with 43% to 37% for Trump and 18% for Kasich, and it gave Sanders a 49% to 47% lead over Clinton. The poll, which followed a week of other surveys showing similar leads for Cruz and Sanders, had a margin of error of plus or minus 3.7 percentage points.

Trump on Sunday called on Kasich to drop out of the Republican presidential race, acknowledging he had raised the issue in a meeting Thursday with Republican National Committee head Reince Priebus. Trump said that Kasich, who's only won his home state of Ohio so far, has no chance of being the nominee.

Kasich hit back that Trump is the one who should step aside.

— Daniel Bice of the Journal Sentinel staff also contributed to this article.