Senator Marco Rubio plans legislation to block U.S. government pensions from investing in Chinese stocks after the board overseeing the funds put off a decision that would add exposure to China.

The Federal Retirement Thrift Investment Board on Monday addressed concerns that switching the benchmark for its $50 billion TSP I Fund to mirror an index with Chinese assets would undermine U.S. economic and national security. A decision was delayed for at least two weeks, according to Kim Weaver, the board’s spokeswoman.

Rubio, a Republican from Florida, called the board’s move not to reverse its plan “unacceptable’’ in a statement Monday and said he would introduce bipartisan legislation “to ensure that federal retirement savings can never be a source of wealth funding the Chinese Communist Party at the expense of our nation’s future prosperity.’’

At a meeting in Washington, FRTIB’s outside consultant, Aon Hewitt, reiterated its recommendation for the fund to resemble the MSCI All Country World ex-U.S. Investable Market Index, said Weaver. China is the third-largest country weight in that index, representing about 7.5%.

The 2017 decision by the TSP board to increase U.S. government workers’ pension fund exposure to Chinese stocks — and the debate over potentially sticking to that decision — has come under fire from some in the Trump administration and a bipartisan group of lawmakers.

A spokesman for Rubio said the bill, which does not yet have co-sponsors, would preclude the savings plan from investing in products or stocks in countries where the Public Company Accounting Oversight Board is restricted from accessing financial accounting information.

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