In the mid-1990s, Representative Jerry Nadler, who represents parts of Manhattan and Brooklyn, once said, “Anyone who would loan Donald Trump money is taking a risk.”

In 2017, Mr. Nadler said President Trump was “legally elected but is not legitimate.”

And this month, The Washington Post reported that in a private conversation with lawmakers, President Trump referred to Mr. Nadler as “Fat Jerry.”

The two native New Yorkers — the Democratic lawmaker and the Republican president — have fought each other for decades, and their mutual disdain seems to have only grown as each man ascended in politics.

Then came the 448-page report from Robert S. Mueller III, the special counsel.

As chairman of the House Judiciary Committee, Mr. Nadler is at the head of congressional Democrats’ efforts to investigate, and perhaps punish, President Trump for what is described in the report, released on Thursday.

[Read more about the Mueller report, including excerpts and analysis.]

From the West Side ...

To put it mildly, Mr. Nadler and Mr. Trump have a history.