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Description:
This is the first in a series of Homeland Security Presidential Directives that shall record and communicate presidential decisions about the homeland security policies of the United States.

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Combating Terrorism Through Immigration Policies

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The Nation requires a Homeland Security Advisory System to provide a comprehensive and effective means to disseminate information regarding the risk of terrorist acts to Federal, State, and local authorities and to the American people.

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The United States will continue to make clear that it reserves the right to respond with overwhelming force — including potentially nuclear weapons — to the use of [weapons of mass destruction] against the United States, our forces abroad, and friends...

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Management of Domestic Incidents

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Integration and Use of Screening Information

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This directive establishes policies to strengthen the preparedness of the United States to prevent and respond to threatened or actual domestic terrorist attacks, major disasters, and other emergencies by requiring a national domestic all-hazards...

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This directive establishes a national policy for Federal departments and agencies to identify and prioritize United States critical infrastructure and key resources and to protect them from terrorist attacks.

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This directive establishes a national policy to defend the agriculture and food system against terrorist attacks, major disasters, and other emergencies.

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Description:
Biological weapons in the possession of hostile states or terrorists pose unique and grave threats to the safety and security of the United States and our allies.