Impeachment has nothing to do with jail. It simply removes someone from their office. Asking for impeachment given the current numbers in the Senate is like asking a minority party in a parliamentary system to use a vote of no-confidence to oust a government, with the difference that it takes a lot more time and effort. I doubt we could get to fifty, let alone the sixty-seven votes needed (At best one Repub vote for (Hagel) and almost certainly a number of conservative Dems against, plus Lieberman.