U.S. foreign policy is largely directed by presidents, but Congress does have considerable influence, as this CFR Backgrounder explains.

An increase in terror incidents involving Islamic radicals who are U.S. citizens is vexing law enforcement officials and posing new questions about the roots of their radicalization.

The Bush administration’s approach to the detention and prosecution of prisoners held at Guantanamo Bay, Cuba, has been deemed unconstitutional by the U.S. Supreme Court. But the battle continues.

Canada has a comparatively open immigration policy designed to attract a group of diverse, educated professionals. But recent arrests linked to a terror cell have raised questions about integration o…

As U.S. public opinion increasingly favors stronger immigration controls, the Senate considers a bill that would impose harsh penalties on illegal immigrants. The U.S.-Mexican relationship has suffer…