Donald Trump called into a CNBC show on Monday morning, allowing host Joe Kernen to ask a question about government spending and, specifically, the large chunk of spending that is committed to social programs. “Have you changed your outlook on how to handle entitlement — Social Security, Medicare, Medicaid, Mr. President?” Kernen asked. “It seems like something has to be done.” At that point, two familiar patterns kicked in. Trump tends to like to align with the opinions offered by his interviewers, particularly on subjects that aren’t at the center of his political identity. He also tends to ramble when...