Lehmann also mentions what seems to be some growing wishful thinking around the non-Trumpian intertubes: that Trump could be impeached. We have to hope he'll do or say something so awful and dangerous to America's security that he will indeed be impeached. Or maybe he'll just resign, when he finds that it's a bit of a bore.
Nixon and Trump differ greatly in intellectual capability and policy orientation. The first opened up relations with China to the great benefit of China, the US and the world. The second seriously risks antagonising relations with China, which will be to the great detriment of the US, China and the world.