The move could scramble election-year politics and lead some conservative Republicans to push for impeachment proceedings against President Barack Obama.
Advocates and lawmakers who've been in touch with the administration say officials are weighing a range of options including changes in the deportation system and ways to grant relief from deportation to targeted populations in the country.
That might include parents or legal guardians of U.S. citizen children - which could be around 3.8 million people - or parents of immigrants brought here illegally as kids who've already received executive relief from Obama. That could be an additional 500,000 to 1 million people.
