1. Short title This Act may be cited as the Campaign Spending Integrity Act . 2. Prohibiting use of campaign funds for payments to vendors owned or controlled by candidate or immediate family member (a) Prohibition Section 313(b) of the Federal Election Campaign Act of 1971 ( 52 U.S.C. 30114(b) ) is amended by adding at the end the following new paragraph: (3) Treatment of payments to vendors owned or controlled by candidate or immediate family member as conversion (A) In general For purposes of paragraph (1), a contribution to an authorized committee of a candidate shall be considered to be converted to the personal use of the candidate if the contribution is used to make a payment to a vendor which is owned or controlled by the candidate or by an immediate family member of the candidate. (B) Determination of ownership and control For purposes of subparagraph (A), a vendor shall be considered to be owned or controlled by a candidate or by an immediate family member of the candidate if the candidate or the immediate family member— (i) is a member of the board of directors or similar governing body of the vendor; (ii) directly or indirectly owns or controls more than 50 percent of the voting shares of the vendor