So determined is House Judiciary Committee chairman Jerry Nadler (D-N.Y.) to impeach the president that he is breaking 200 years of precedents to do so. Two hundred years of precedents declare that the House must first authorize its Judiciary Committee to open a formal impeachment inquiry. Only then can that committee proceed with an investigation to determine if the president has committed crimes worthy of impeachment. If such evidence is uncovered, then the full House must vote to approve one (or more) of the committee’s articles of impeachment. If an article is (or articles are) approved, then the Senate may...