Trump Jr. is scheduled to appear with Cruz at rallies in Wichita Falls and in Conroe.
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The rally in Conroe is being held at the Lone Star Convention Center on Wednesday, Oct. 3 at 8:30 p.m.
Sen. Cruz to get helping hand from Trump in race against Rep. O'Rourke
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President Trump to stump for Ted Cruz in Texas
Activists to display billboard showing Trump tweets criticizing Sen. Cruz
Activists raise enough money for billboard showing Trump's tweets criticizing Ted Cruz