7 Days S01E01 - Pilot: Part 1

The President and Vice President were killed in a terrorist attack. Now it seems that a secret branch of the government has in their possession technology from the alien landing at Roswell, and they were able to use it to create a time machine that can send someone back in time seven days. And they would like to send someone back before this happened and tell what's going to happen before it does so they can prevent it.