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Senator Ted Cruz, a Republican from Texas, speaks during a rally for U.S. President Donald Trump in El Paso, Texas, U.S., on Monday, Feb. 11, 2019. Trump and prospective Democratic challenger Beto O'Rourke took part in dueling rallies in Texas on Monday, with each using the president's proposed border wall as an early proxy for the 2020 election. Photographer: Adria Malcolm/Bloomberg via Getty Images

Senator Ted Cruz, a Republican from Texas, speaks during a rally for U.S. President Donald Trump in El Paso, Texas, U.S., on Monday, Feb. 11, 2019. Trump and prospective Democratic challenger Beto O'Rourke took part in dueling rallies in Texas on Monday, with each using the president's proposed border wall as an early proxy for the 2020 election. Photographer: Adria Malcolm/Bloomberg via Getty Images