The United States threatened Syria over the weekend that it would soon face sanctions for harboring and supporting terrorist organizations.

The White House said on Friday that the U.S. is moving toward implementing the Syria Accountability Act, passed by Congress earlier this year.

"Our goal is to make sure we take steps that will lead to Syria changing its behavior ... And we'll have more to say on that very soon," spokesman Scott McClellan said. Hamas, Islamic Jihad and others have offices in Damascus, and Syria supports Hezbollah in southern Lebanon. McClellan said Syria sheltered terror groups, gave safe passage to foreign fighters who attack U.S. troops, is active in Lebanon and played a part in obtaining weapons of mass destruction.

Congress members who initiated the Syria Accountability Act threatened to take legal steps if the administration continues to delay imposing the sanctions.