(CNN) Someday, Donald Trump will become ex-President Trump. So imagine ex-President Trump tweeting out real-time commentary on every move his successor makes. Our nation's thought leaders need to develop and agree to principles now to mitigate the looming threat posed by ex-President Trump. One might apply to the next president, whether Democratic or Republican: Simply do not engage with ex-President Trump, no matter how vicious his attacks become; isolate him by ignoring him. We can't afford to be blindsided, yet again, by the potential for ex-President Trump to shatter more norms and continue to shake the foundations of our democracy.

Source: CNN August 30, 2018 18:11 UTC