Excerpt from Joe's Politico column:
Trump clearly doesn’t give a damn what polite society thinks of his presidential prospects. ... I called Trump last Friday to see if he would back off his claim that the president of the United States might be constitutionally prohibited from holding his office. “I’m not finished with that issue by any stretch of the imagination,” Trump told me. “You mock me for that, but his own grandmother says he was born in Kenya and says she was there.”
Read the entire column at Politico.