You might recall that I have been of the opinion that impeachment would be a waste of time and energy. It would never get past the Senate even if it were to shift Republican, because they need a 2/3 vote to impeach.
Obama has said that he plans on a significant executive order on immigration by the end of the summer. Some are speculating that might mean giving amnesty to the parents of the beneficiaries of DACA, or parents of anchor babies. Some have thrown around a number of 5 million. That would already be more than the whole amnesty under Reagan. The Hispanic Caucus just wants him to grant amnesty as would have occurred under the Senate bill.
If he did any of those things, could that be the straw that broke the camel's back? Could Congress really ignore that ... essentially failure to secure the borders? Would Obama risk that so that the Republicans could be demonized as racists for the 2014 (or 2016) elections?