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In an aerial view, a Texas National Guard soldier stands atop a barrier of shipping containers and razor wire while guarding the U.S.-Mexico border as people play at Eagle Pass Golf Course on March 17 in Eagle Pass, Texas. Texas National Guard troops have fortified the U.S.-Mexico border with vast a amount of razor wire as part of Governor Greg Abbott's "Operation Lone Star" to deter migrants from crossing into Texas. The U.S. southwestern border stretches nearly 2,000 miles, from the Gulf of Mexico to the Pacific Ocean and is marked by fences, deserts, mountains and the Rio Grande, which runs the entire length of Texas. The politics surrounding border and immigration issues have become dominant themes in the U.S. presidential election campaign. (Photo by John Moore/Getty Images)