House Democratic Leader Nancy Pelosi (Calif.) on Thursday called President Trump’s furious reaction to an anonymous administration official's op-ed disparaging him in The New York Times a “manifestation of his instability.” Pelosi said her “first thought” was that Vice President Pence penned the opinion piece, which described efforts among staffers in the Trump administration to push back against the president's instincts. Not long after the op-ed was published Wednesday afternoon, Trump tweeted “Treason?” in all caps. He later demanded the Times identify the piece's author "for National Security purposes." “The president saying it’s treason is, again, a manifestation of his...