11 CFR 108.3 – Filing copies of reports and statements in connection with the campaign of any congressional candidate (52 U.S.C. 30113(a)(2))
(a) Except as provided in § 108.1(b), a copy of each report and statement required to be filed under 11 CFR part 104 by candidates, and the authorized committees of candidates, for nomination for election or election to the office of Senator; by other committees that support only such candidates; and by the National Republican Senatorial Committee and the Democratic Senatorial Campaign Committees shall be filed with the appropriate State officer of that State in which an expenditure is made in connection with the campaign.
(b) Except as provided in § 108.1(b), a copy of each report and statement required to be filed under 11 CFR part 104 by candidates, and authorized committees of candidates, for nomination for election or election to the office of Representative in, Delegate or Resident Commissioner to the Congress, or by unauthorized committees, or by any other person under 11 CFR part 109, in connection with these campaigns shall be filed with the appropriate State officer of that State in which an expenditure is made in connection with the campaign.
(c) Unauthorized committees that file reports pursuant to paragraph (b) of this section are required to file, and the Secretary of State is required to retain, only that portion of the report applicable to candidates seeking election in that State.