Republican strategist Karl Rove says Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE can clinch the Republican presidential nomination with a victory in Wisconsin’s primary Tuesday.

“If he wins Wisconsin, the contest is over,” Rove said Tuesday, according to Politico.

ADVERTISEMENT

“He’s spent a lot of time there,” he added. "If he wins, it’s over. If not, it’s gonna go on and the math becomes somewhat more difficult. If he loses, it’s gonna be a tougher contest.”

Tuesday’s vote in Wisconsin is an open primary, meaning that Democrats and independents can cast ballots for Republican candidates. Rove said the format favors Trump.

“Trump has done slightly better in states where there is an open primary, where Democrats and independents can come in and vote, and has done slightly worse in states that have a closed primary, where only registered Republicans can vote,” the GOP strategist said.

Rival Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE leads Trump by about five points in Wisconsin, according to the RealClearPolitics polling average.

Trump leads the delegate race overall, though, with 737 delegates acquired so far, to Cruz’s 475 and John Kasich’s 143. Wisconsin’s primary has 42 delegates on the line. A candidate must reach 1,237 delegates to clinch the nomination before the Republican National Convention this summer.