The victim is identified as Marco Ortiz, 30, media reports said. He was bitten at his apartment at around 6:45 am Monday, then ran to a nearby gas station for help.
Ortiz said he was left gushing blood after his friend tore into it with his teeth during a row in their flat in Pittsburgh, Pennsylvania.
Ortiz said: "When he bite it, I see it, I see a little piece on the floor, and then bleeding."
Ortiz had just returned home in the early hours of the morning yesterday when the pair became embroiled in the dispute over Trump.
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He said: "Anytime he's drinking, he's going crazy. All he would say is 'if Donald Trump gonna take me out I gotta kill so many people, then somebody kill me and I am happy."
Ortiz said his roommate attacked him, breaking his finger and biting a chunk out of his ear, and also threatened to kill him before he managed to escape.
Police are still looking for the housemate, who has not been named. Ortiz said his housemate was in the US legally.
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