The United States protects its national security most directly by ensuring that a treaty signed by the President of the United States must be approved by two-thirds of the Senate before it can go into effect.
National security is the safety of a nation against threat whether internal or external. National security ensures that a nation is secured against terrorism, war, or espionage.
It is the job of a president to guarantee the safety of his/her citizens against domestic or international threat.
The president can achieve this by entering into security treaties and such treaties must be approved by at least two thirds of the senate members.
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