Transcript for President Obama Addresses Critics in Immigration Announcement
Now to the showdown over immigration. President Obama addressing the nation last months, plan that could grant 5 million undocumented immigrants legal status. Republicans vowing to use every tool to fight what they call executive overreach. Jonathan Karl is in Washington. Reporter: Good morning. The president heads to Las Vegas today with top democrats Nancy Pelosi and harry Reid to hail a promise kept on immigration. In his primetime address, the president said he acted on his own because congress has failed to fix a broken immigration system. And so those members of congress who question my authority to make our immigration system work better, or question me acting where congress has failed, I have one answer, pass a bill. Reporter: Immigrants and their supporters were ecstatic. 5 million people in the U.S. Illegal will be eligible for temporary legal status and work permits. The biggest group, undocumented immigrants who have children who were U.S. Citizens, born here. They must have been in the U.S. For more than five years. Pay a fee of about $500 and have no criminal record. If you meet the criteria, you can come out of the shadows and get right with the law. If you're a criminal, you'll be deported. If you enter the U.S. Illegally, your chances of getting caught and sent back went up. Reporter: The republicans are trying to undo the actions. It's incumbent on republicans in congress to use every single constitutional rule to rein in a president so the president does not become an unaccountable monarch. Reporter: The president will officially set this all in motion today. But, David, it is going to talk a while to go into effect. The first undocumented immigrants who are eligible won't begin to apply likely until the spring. All right, thanks. As we mentioned at the top, the first interview is in George. You can see it Sunday on "This week."
This transcript has been automatically generated and may not be 100% accurate.