From US House bill H. R. 2319:
“(b) Election To Be A Stable Value Money Market Fund.—
“(1) IN GENERAL.—Notwithstanding any other provision of this title, any open-end investment company (or a separate series thereof) that is a money market fund that relies on section 270.2a–7 of title 17, Code of Federal Regulations, may, in the prospectus included in its registration statement filed under section 8 state that the company or series has elected to compute the current price per share, for purposes of distribution or redemption and repurchase, of any redeemable security issued by the company or series by using the amortized cost method of valuation, or the penny-rounding method of pricing, regardless of whether its shareholders are limited to natural persons, if—
“(A) the company or series has as its objective the generation of income and preservation of capital through investment in short-term, high-quality debt securities;
“(B) the board of directors of the company or series elects, on behalf of the company or series, to maintain a stable net asset value per share or stable price per share, by using the amortized cost valuation method, as defined in section 270.2a–7(a) of title 17, Code of Federal Regulations (or successor regulation), or the penny-rounding pricing method, as defined in section 270.2a–7(a) of title 17, Code of Federal Regulations (or successor regulation), and the board of directors of the company has determined, in good faith, that—
“(i) it is in the best interests of the company or series, and its shareholders, to do so; and
“(ii) the money market fund will continue to use such method or methods only as long as the board of directors believes that the resulting share price fairly reflects the market-based net asset value per share of the company or series; and
“(C) the company or series will comply with such quality, maturity, diversification, liquidity, and other requirements, including related procedural and recordkeeping requirements, as the Commission, by rule or regulation or order, may prescribe or has prescribed as necessary or appropriate in the public interest or for the protection of investors to the extent that such requirements and provisions are not inconsistent with this section.
Also see US Senate S. 1117, Consumer Financial Choice and Capital Markets Protection Act of 2017