For Americans worried about the state of its republic, Watergate analogies can be a comforting salve. If FBI Director James Comey’s firing is President Donald Trump’s Saturday Night Massacre, then impeachment hearings should be coming down the road — perhaps soon. But even if Comey’s firing leads to a widening scandal, some of the lessons of Watergate should worry Trump opponents more than soothe them, writes USSC research associate Dr Nicole Hemmer for Vox.