Prohibition on the warrantless acquisition of domestic communications

No officer or employee of the Federal Government may intentionally acquire, for the purpose of acquiring foreign intelligence information, any communication as to which the sender and all intended recipients are known to be located in the United States at the time of acquisition or the time of communication, regardless of whether such acquisition occurs inside or outside the United States, except— (1) as authorized under section 105 or 304 of the Foreign Intelligence Surveillance Act of 1978 (50 U.S.C. 1805, 1824); or (2) if— (A) the officer or employee has a reasonable belief that— (i) an emergency exists involving the imminent threat of death or serious bodily harm; and (ii) in order to prevent or mitigate this threat, the acquisition must be conducted before an authorization pursuant to the provisions of law cited in paragraph (1) can, with due diligence, be obtained; and (B) not later than 14 days after the acquisition, a description of the acquisition is provided to the congressional intelligence committees.