"Mr. Trump, you’re a racist and you can take your border wall and shove it up your ass," the Brownsville Democrat wrote in a lengthy missive to the real estate magnate.

"Before you dismiss me as just another 'Mexican,' let me point out that my great-great grandfather came to this country in 1857, well before your own grandfather," he wrote. "His grandchildren (my grandfather and his brothers) all served our country in World War I and World War II. His great-grandson, my father, served in the U.S. Army and, coincidentally, was one of the first 'Mexican' federal judges ever appointed to the federal bench."