Donald Trump speaks at Fountain Park during a campaign rally on March 19, 2016 in Fountain Hills, Ariz. Ralph Freso/Getty Images hide caption

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Ralph Freso/Getty Images

Young Republicans Ponder Trump's Lasting Impact On The GOP

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Republican presidential candidates, Sen. Marco Rubio, R-Fla., left, Donald Trump, Sen. Ted Cruz, R-Texas, and Ohio Gov. John Kasich, right, stand together during the signing of the National Anthem, before the start of the Republican presidential debate Thursday in Miami. Wilfredo Lee/AP hide caption

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Wilfredo Lee/AP

Democratic presidential candidate Sen. Bernie Sanders scored an upset win in Michigan on Tuesday. He's seen here speaking last week in Illinois, which holds its primary next Tuesday. Seth Perlman/AP hide caption

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Seth Perlman/AP

Bernie Sanders addresses a rally at Macomb Community College in Warren, Mich. Sanders needs a good showing in Michigan on Tuesday to start to turn his campaign around. Scott Olson/Getty Images hide caption

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Scott Olson/Getty Images

Marco Rubio and Donald Trump participate in the Republican presidential debate in Detroit. Geoff Robins/AFP/Getty Images hide caption

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Geoff Robins/AFP/Getty Images

Marco Rubio Defends His 'Small Hands' Criticism Of Donald Trump

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Donald Trump addresses a crowd in South Carolina. Trump has the clearest path to the GOP nomination, but Republicans opposed to him aren't giving up the fight. Spencer Platt/Getty Images hide caption

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Spencer Platt/Getty Images

Donald Trump greets supporters after speaking at a caucus night watch party at the Treasure Island Hotel & Casino in Las Vegas. Trump is favored to do well Super Tuesday. Ethan Miller/Getty Images hide caption

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Ethan Miller/Getty Images

Republican presidential candidate Donald Trump speaks at his election night party February 20, 2016 in Spartanburg, South Carolina. The New York businessman won the first southern primary decisively. Spencer Platt/Getty Images hide caption

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Spencer Platt/Getty Images