TYLER, Texas—As a military surgeon in Vietnam, Dr. James McDaniel, saw plenty of blood, pain, and death from battle. But what McDaniel witnessed at the United States southern border in July at McAllen, Texas, opened his eyes to a new kind of suffering; the pain, misery, and looming death stemming from illegal immigration. The former Mobile Army Surgical Hospital doctor came to the conclusion after spending five revealing days in what seemed like a South Texas battle zone. “Close the borders and put an end to the suffering,” he said. “It’s the right thing to do.” His wife, Nikki, a retired career trauma nurse, concurred. “As a native Texan, you hear about the suffering and trauma illegal immigrants are exposed to and how dangerous it is,” she said, “but when you see it with your own eyes, it just makes you angry.” The McDaniels were part of a five-day medical …