If it is not Tulsi Gabbard's job to determine what an "imminent threat" is to the US, then what is her job?

If it is not Tulsi Gabbards job to determine what an imminent threat is to the US, then what is her job?
If it is not Tulsi Gabbard's job to determine what an "imminent threat" is to the US, then what is her job?
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