The current House leadership is notably gun-shy about impeachment. But over the last two years, House Democrats have threatened to impeach Trump for much less. In the previous Congress, for example, Congressman Steve Cohen introduced articles charging Trump with, among other things, overspending on golf cart rentals at Mar-a-Lago. In January 2018, Congressman Al Green got 66 Democratic votes to move forward on a resolution to impeach Trump for "attempting to convert his bigoted statements into United States policy" in the form of the travel ban and the ban on transgender troops.

Surely, more Democrats--and even a few Republicans, like Congressman Justin Amash--could rouse themselves to threaten impeachment to avoid a disastrous war in violation of a core constitutional guarantee.