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HOUSTON, TX - MARCH 15: Republican presidential candidate Sen. Ted Cruz (R-TX) speaks at a watch party on March 15, 2016 in Houston, Texas. Cruz is in a tight race with Donald Trump in the Missouri GOP primary, while Trump took Florida, North Carolina, and Illinois. Gov. John Kasich won his home state of Ohio. (Photo by Bob Levey/Getty Images)

HOUSTON, TX - MARCH 15:  Republican presidential candidate Sen. Ted Cruz (R-TX) speaks at a watch party on March 15, 2016 in Houston, Texas.  Cruz is in a tight race with Donald Trump in the Missouri GOP primary, while Trump took Florida, North Carolina, and Illinois. Gov. John Kasich won his home state of Ohio. (Photo by Bob Levey/Getty Images)