MSNBC’s Joe Scarborough said the president’s behavior is growing increasingly “erratic” — and co-host Mika Brzezinski suggested his Cabinet may be preparing a constitutional challenge. The “Morning Joe” host and his panelists reacted to the alarming Vanity Fair report that described the crisis within the White House, where aides say the president is “unraveling” in a job he’s not suited to hold. “He’s isolated,” Brzezinski said. “He’s probably going crazy.” Scarborough and Brzezinski, who have known the president for years, said Trump spent most of his career greeting associates and well-wishers in his office, fielding phone calls and gossiping with...