House Speaker Nancy Pelosi and her committee leaders have been notably shy about using the I-word. House Judiciary Committee chairman Jerrold Nadler has gone the furthest, announcing this weekend that his panel will begin investigations into President Donald Trump's "obstruction of justice, corruption and abuse of power".
Impeachment is "a long way down the road", said Mr Nadler, adding that "we're going to initiate proper investigations". But that doesn't go far enough. At this point, it would be an abdication of responsibility for the House not to pursue a single, formal, systematic impeachment inquiry.