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Republican presidential candidate, businessman Donald Trump, second from left, gestures as Sen. Marco Rubio, R-Fla., Sen. Ted Cruz, R-Texas, and Ohio Gov. John Kasich watch him a Republican presidential primary debate at Fox Theatre, Thursday, March 3, 2016, in Detroit
Republican presidential candidate, businessman Donald Trump, second from left, gestures as Sen. Marco Rubio, R-Fla., Sen. Ted Cruz, R-Texas, and Ohio Gov. John Kasich watch him a Republican presidential primary debate at Fox Theatre, Thursday, March 3, 2016, in Detroit

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    Watch Ted Cruz pledge to support GOP nominee at debate

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Watch Ted Cruz pledge to support GOP nominee at debate

At the March 3, 2016, Fox News Republican debate in Detroit, Sen. Ted Cruz, Sen. Marco Rubio and Gov. John Kasich were asked if they would support Donald Trump if he wins the Republican nomination.

Watch Ted Cruz pledge to support GOP nominee at debate

At the March 3, 2016, Fox News Republican debate in Detroit, Sen. Ted Cruz, Sen. Marco Rubio and Gov. John Kasich were asked if they would support Donald Trump if he wins the Republican nomination.