Speaker of the House Kevin McCarthy (R-CA) announced the start of an impeachment inquiry Tuesday into President Joe Biden over his family’s businesses. But he stopped short of calling for a vote to authorize the inquiry. The problem: Republicans argued during the first impeachment of President Donald Trump that Democrats could not use Congress to subpoena the White House until the House had voted to authorize an impeachment inquiry. In fact, that argument was a major part of President Trump’s defense against the charge that he obstructed Congress by refusing to comply with subpoenas issued before an inquiry had been...