Michael Chertoff was sworn in as secretary of the Department of Homeland Security yesterday. President Bush was on hand for the ceremony and in his remarks, he mentioned Osama bin Laden by name for the first time in recent memory. “Recently, we learned that Osama bin Laden has urged the terrorist Zarqawi to form a group to conduct attacks outside Iraq, including here in the United States,” said Bush. “We’re on a constant hunt for bin Laden. We’re keeping the pressure on him, keeping him in hiding. And today Zarqawi understands that coalition and Iraqi troops are on a constant hunt for him as well. Coalition and Iraqi forces have caught and killed several of his key lieutenants. We’re working every day and night to dismantle his network and to bring him to justice.”