The Conduit

The campaign storyline focuses on an alien invasion of Washington, D.C. in the near future. The alien race, known as the Drudge, uses the eponymous portal-like Conduits to deploy their forces throughout the city. A shadow government organization called the Trust sends newly inducted agent Michael Ford into the area initially to disrupt a terrorist threat, but he quickly becomes embroiled in the fight to stop the invasion and save the capital from destruction. (wiki)