Now that Robert Mueller III has been appointed special counsel to investigate ties between President Trump’s campaign and Russia, Democrats and even a few Republicans are drawing comparisons between the present mess and the Watergate scandal that brought down Richard Nixon.
Senator John McCain of Arizona pegged the president’s problems at a “point where it’s of Watergate size and scale” after reports surfaced that Mr. Trump had pressed James Comey, then the F.B.I. director, to quash an investigation of Mike Flynn, the Trump loyalist and former national security adviser. David Gergen, who was a White House aide to four presidents in