Important Jonathan Martin NYT news analysis:

In fact, this past week offered a vivid illustration of how little regard Mr. Trump has for the long-held expectations of America’s leaders. He is not only breaking the country’s political norms, he and his campaign aides are now all but mocking them.

Besides using his campaign as a platform to make money on a new hotel, Mr. Trump leveled an untrue assertion that Hillary Clinton had been the first to claim Mr. Obama was born abroad. He also boasted about his healthon the show of a daytime television celebrity while releasing just his testosterone levels and a few other details about his well-being.

Mr. Trump also continued to flout 40 years of tradition by refusing to release his tax returns, a decision that his eldest son admitted this week was not based on an audit, as Mr. Trump has repeatedly claimed, but on a desire not to “distract” from the campaign’s “main message.”

Beyond his handling of personal information, he also casually accused the chairwoman of the Federal Reserve of corruption, claimed that the bipartisan national debate commission was rigged against him, and stated that Mrs. Clinton had not proposed a child care plan. (She has, and did so a year before he did.)

He also mocked an African-American pastor who had just welcomed him to her church, and again referred to Senator Elizabeth Warren of Massachusetts, who once said she had Native American roots, as “Pocahontas.”

And that was all before Friday night, when Mr. Trump hinted at violence against Mrs. Clinton by inviting her Secret Service detail to disarm “and see what happens to her.”

Routine falsehoods, unfounded claims and inflammatory language have long been staples of Mr. Trump’s anything-goes campaign. But as the polls tighten and November nears, his behavior, and the implications for the country should he become president, are alarming veteran political observers — and leaving them deeply worried about the precedent being set, regardless of who wins the White House.