Excerpts
In Trump's first 298 days in office, however, he made 1,628 false or misleading claims or flip-flops, by The Post's tally. That's about six per day, far higher than the average rate in our studies. And of course, reporters have access to only a subset of Trump's false statements — the ones he makes publicly — so unless he never stretches the truth in private, his actual rate of lying is almost certainly higher.

That rate has been accelerating. Starting in early October, The Post's tracking showed that Trump told a remarkable nine lies a day, outpacing even the biggest liars in our research.

Just 0.8 percent of the lies told by the college students and 2.4 percent of the lies told by the community members were mean-spirited.

....The most stunning way Trump's lies differed from our participants', though, was in their cruelty. An astonishing 50 percent of Trump's lies were hurtful or disparaging.