Waterboarding has long been considered a war crime by the United States.
Here I lift just one example from Wikipedia:
“In 1947, during the Yokohama War Crimes Trials, the United States prosecuted a Japanese civilian who had served in World War II as an interpreter for the Japanese military, Yukio Asano, for “Violation of the Laws and Customs of War”, asserting that he “did unlawfully take and convert to his own use Red Cross packages and supplies intended for” prisoners, but, far worse, that he also “did willfully and unlawfully mistreat and torture” prisoners of war. The charges against Asano included “beating using hands, fists, club; kicking; water torture; burning using cigarettes; strapping on a stretcher head downward.”[223] The specifications in the charges with regard to “water torture” consisted of “pouring water up [the] nostrils” of one prisoner, “forcing water into [the] mouths and noses” of two other prisoners, and “forcing water into [the] nose” of a fourth prisoner.[224] Asano received a sentence of 15 years of hard labor.”
If you want to support Trump, fine. Like others, you should just pretend you don't take Trump seriously when he advocates for war crimes.
I’m fine with waterboarding.
Nice try, but this is not the case. It is a violation of the protections of lawful combatants who are captured--and nobody is advocating waterboarding lawful combatants.
People blending into to a population out of uniform for the mass murder of civilians do not fall under the protections of lawful prisoners of war.
If there are any other arguments that may actually be valid, I still welcome hearing of them.