Amid recent chatter that Trump could fire special counsel Robert Mueller, Sens. Lindsey Graham (R-SC) and Jeff Flake (R-AZ) both suggested Tuesday that if the president took that step, impeachment would be the appropriate response. Graham and Flakes commitments to this position were hardly rock-solid and may well not be shared by very many other Republicans in the Senate (or the House of Representatives, which is where the impeachment process would have to begin).