This post was updated on Dec. 1, 2014, at 4:52 p.m.

President Obama is set to announce executive action tonight, granting temporary relief to some of the nearly 12 million immigrants who are living in the United States illegally. Here's what we know so far:

1. What kind of relief is the president offering?

Obama's move lifts the threat of deportation — at least temporarily. But it does not provide the full path to citizenship as envisioned under a comprehensive immigration bill.

2. Who is eligible for relief?

There are two main groups:

  • Parents of U.S. citizens or legal permanent residents (green card holders) of the U.S. for at least five years. The Migration Policy Institute estimates there are some 3.7 million unauthorized immigrants who meet those criteria.
  • Also, an expanded group of people who were brought to the U.S. illegally as children. This group now includes anyone who arrived in the U.S. before Jan. 1, 2010, and who is under the age of 16. (Obama had already granted relief under a 2012 policy known as DACA to those who arrived before June 15, 2007, and were not yet 31 years old.) Lifting the upper age limit and pushing back the arrival deadline provides relief to an estimated 290,000 additional people, according to the Migration Policy Institute.

Granting relief to these two groups will still leave millions of undocumented immigrants for authorities to focus their attention on. The administration will be issuing new guidance, reiterating that scarce deportation resources should be used for those who pose a threat or break the law, not people who have become part of the fabric of society.
3. Will immigrants eligible for relief under this plan be allowed to work?

In most cases, yes.

4. Can they collect Social Security, Medicare or other government benefits?

Immigrants covered under this program will receive valid Social Security numbers. After 10 years of paying payroll taxes, they would become eligible to collect retirement benefits and Medicare. They may also be eligible for the Earned Income Tax Credit — a tax subsidy for low-wage workers. But they are ineligible for insurance subsidies and other benefits under the Affordable Care Act, which explicitly excludes immigrants who entered the country illegally. And they are not required to carry health insurance under the ACA's "individual mandate."

Immigrants granted temporary status under the Administration's earlier DACA policy are generally NOT eligible for food stamps (formally known as SNAP benefits). Medicaid eligibility varies by state. Hospitals in every state already offer labor and delivery services, regardless of immigration status.

5. What about driver's licenses? Or discounted, in-state tuition at public universities?

Those decisions are made at the state level and are not necessarily tied to federal policy. For example, the National Immigration Law Center cites at least 10 states that already allow immigrants to apply for driver's licenses, regardless of their legal status. Conversely, two states — Arizona and Nebraska — continue to deny licenses to immigrants who were granted temporary legal status under DACA.

6. Why is President Obama taking this action now?

Obama says he would prefer to see Congress pass a comprehensive immigration bill, which would go further and be more permanent than this executive action. But the bipartisan bill that passed the Senate in 2013 has languished in the House for nearly a year and a half. Obama says that delay has been costly both to the economy and to those who live in fear that they or a loved one may be deported.

7. Republicans have warned Obama not to take this action on his own, saying it will "poison the well" for future cooperation. What recourse do the president's congressional critics have?

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