Op-edA small number of Republican senators soon face a "profile in courage" challenge as President Trump and his clique of advisers run roughshod over the U.S. Constitution, its guarantees and the national interest of the American people. Republicans hold a narrow 52-48 edge in the Senate, which must approve cabinet-level nominees, treaties and judicial appointments. No one has to switch parties, but a temporary alliance across party lines would halt the Trump-Bannon machine in its tracks.