Frustrated by the loss of his Twitter account and forced to accept that he soon must leave office, President Trump has effectively stopped doing his job, delegating daily responsibilities to Vice President Mike Pence while hunkering down with a shrinking group of acquiescent aides and contemplating additional presidential pardons. Trump had considered leaving the White House before his final day in office Wednesday, even as early as this weekend, but he has opted to depart on the morning of President-elect Joe Biden’s Inauguration Day, according to two people familiar with discussions who cautioned that, with Trump, plans are always subject...