When President Trump chose to trust Putin over the United States' own intelligence agencies on live TV, it was arguably the most abnormal moment in a presidency rife with them.
Trump's statements in Helsinki have received swift and, so far, sustained condemnation. But the summit is just one in a series of Trump controversies that would have ended another presidency. And despite how shockingly and indisputably out of the norm Trump's comments were, the public may struggle to grasp their enormity and could soon move on, if history is any guide.
What's behind the collective tendency to normalize Trump's out-of-the-ordinary behavior and policies?