WASHINGTON - U.S. Rep. Filemon Vela took a poison pen to the Republican presumptive presidential nominee, Donald Trump, in an open letter Monday morning.

"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.

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"While you would build more and bigger walls on the U.S.-Mexico border, I would tear the existing wall to pieces," Vela wrote. "Why any modern-thinking person would ever believe that building a wall along the border of a neighboring country, which is both our ally and one of our largest trading partners, is frankly astounding and asinine."

"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 continued. “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."