Let’s imagine an extreme hypothetical. Say a president takes office and installs a bust of Hitler in the Oval Office and starts quoting from Mein Kampf. Or does the same with Stalin, or Mao. Americans would be horrified; surely (hopefully!) 97 percent of the people would instantly decide that this man should not be the president. Would Congress be within its rights to start impeachment proceedings against this president?

I asked six constitutional experts what they thought, and four said, to varying degrees, that this could constitute legitimate impeachment grounds.