U.S. sanctions against any country offering asylum to Edward Snowden advanced in Congress on Wednesday as the 30-year-old National Security Agency leaker remained in a Moscow airport while Russia weighed a request for him to stay permanently.

The measure introduced by Sen. Lindsey Graham, R-S.C., demands the State Department coordinate with lawmakers on setting penalties against nations that seek to help Snowden avoid extradition to the United States, where authorities want him prosecuted for revealing details of the government's massive surveillance system. The Senate Appropriations Committee approved the proposal unanimously by voice vote as an amendment to next year's $50.6 billion diplomacy and international aid bill.

"I don't know if he's getting a change of clothes. I don't know if he's going to stay in Russia forever. I don't know where he's going to go," Graham said. "But I know this: That the right thing to do is to send him back home so he can face charges for the crimes he's allegedly committed."