Washington (CNN) - In an election-year policy change, the Obama administration said Friday it will stop deporting young illegal immigrants who entered the United States as children if they meet certain requirements.

Under the new policy, people younger than 30 who came to the United States before the age of 16, pose no criminal or security threat, and were successful students or served in the military can get a two-year deferral from deportation, Homeland Security Secretary Janet Napolitano said.

In an interview with CNN's Wolf Blitzer, Napolitano explained the new policy in detail and emphasized that this is not a pathway to citizenship. "That's where Congress needs to act," Napolitano said, "We continue to urge the Congress to pass the DREAM Act, look at comprehensive immigration reform, the immigration system as a whole."

Blitzer's full interview with Napolitano airs Friday on "The Situation Room with Wolf Blitzer," from 4pm to 6pm ET.