New al Qaeda leader Ayman al-Zawahiri is calling on his followers to continue to fight the United States after the killing of Osama bin Laden.

In a video posted on militant websites Sunday, al-Zawahiri calls America a "criminal country" that has corrupted the world.

"Chase America, which killed the leader of the mujahedeen and threw his body into the sea," al-Zawahiri said. "Go after it so that history will say that God enabled his worshippers to attack a criminal country which has spread corruption in the world."

He also said the uprisings in Egypt and Tunisia have provided opportunities for the group to spread its message.

CBN News Terrorism Analyst Erick Stakelbeck offered insight on al-Zawahiri's leadership and the recent video posted online.

Click play for his comments.