(a)
Limitation— No funds available for the United States Armed Forces may be obligated or expended for the Armed Forces to engage in operations to invade or seize territory from Canada, the Republic of Panama, or the self-governing territory of Greenland, in the absence of—
(1)
a declaration of war by Congress;
(2)
specific statutory authorization by Congress; or
(3)
a national emergency created by attack or imminent threat of attack upon the United States, its territories or possessions, or its Armed Forces.
(b)
Additional limitation relation to national emergency— Funds available for the United States Armed Forces may be obligated or expended for introduction of United States Armed Forces into hostilities, or into situations where imminent involvement in hostilities is clearly indicated by the circumstances, by reason of a national emergency created by an attack or imminent threat of attack upon the United States, its territories or possessions, or the Armed Forces only during the 60-day period beginning on such date of introduction of United States Armed Forces.