Pulitzer Prize-winning newspaper columnist and former assistant managing editor for The Washington Post explained on MSNBC's Morning Joe Tuesday why real estate mogul Donald Trump's candidacy should be taken seriously.

"Trump now gives credence to a theory that requires a massive coverup, spanning nearly five decades, that includes not just Obama and his family but also officials of the state of Hawaii — and the cooperation of long-ago clerks and perhaps editors at Honolulu newspapers who printed a “fake” birth announcement in 1961 and waited patiently, all these years, for that baby boy to become president of the United States," he wrote in a column at The Washington Post. "But that’s just for starters. Imagine, if you dare, what the foreign policy of a President Trump would be like."

Visit msnbc.com for breaking news, world news, and news about the economy