By Katie Rogers The White House has been rocked by turnover and anxiety over the midterms. The president, who is tightening his inner circle, has lashed out at critics, held meandering rallies and feasted on a diet of news clips and “A.I. slop,” as one aide put it. President Trump’s private dining room, located just off the Oval Office, is where he goes to watch television, make phone calls and sift through stacks of printed-out news articles and documents that eat up most of the space. A spot has been…