White House hopeful Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE on Wednesday said the Geneva Conventions are the reason U.S. soldiers are "afraid to fight."

“The problem is we have the Geneva Conventions, all sorts of rules and regulations, so the soldiers are afraid to fight,” Trump said at a campaign event in Appleton, Wis., less than a week before the state's primary.

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Trump has repeatedly called for the use of enhanced interrogation techniques and last week, in the wake of the terrorist attacks in Brussels, said he would authorize any means necessary for interrogating terror suspects, including waterboarding.

“We can’t waterboard, but [the Islamic State in Iraq and Syria] can chop off heads,” the celebrity businessman said on Wednesday.

Trump is in a tight race against Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE in the Badger State. Cruz leads the GOP front-runner by 3 points, according to RealClearPolitics poll average. A Marquette Law School poll released Wednesday found Cruz with a 10-point lead.

The Texas senator also got a significant endorsement on Tuesday from Wisconsin Gov. Scott Walker, who called Cruz "a principled constitutional conservative who can win."