Michigan Republicans and Democrats exchanged barbs Monday over Chinese investment in the U.S. — and in Michigan in particular.

Michigan Republicans accused prominent state Democrats of providing a “safe zone” for companies fronting for the Chinese Communist party.

The criticism is tied to recent projects involving companies planning manufacturing investments in Michigan.

The main criticism involves a planned electric vehicle battery plant near Big Rapids. The company behind the project, Gotion, is a U.S.-based subsidiary of a Chinese company. The articles of association of the parent company say it must “carry out party activities in accordance with the constitution of the Communist party of China,” but a spokesperson for the company has said there’s distance between the Chinese government and the company’s business decisions.

Republican U.S. Senate candidate and former congressman Mike Rogers accused his Democratic opponent, Representative Elissa Slotkin, of playing a role in attracting the project to west Michigan.

“I can tell you as a member of Congress for those seven terms, never once — never once — did I see an elected official sign a non-disclosure agreement for any issue, let alone a company that is tied to the communist party of China,” said Rogers.

A spokesman for Democratic Senate candidate Elissa Slotkin called Rogers’ allegations a “false attack,” insisting Slotkin has never signed any agreement involving a project connected to the Chinese government.

Slotkin has introduced legislation giving the federal government additional authority to investigate Chinese-backed business dealings in the United States.

Democrats counter that Republicans are trying to distract from Rogers’ own history of working with U.S. companies that have partnered with Chinese businesses.

Rogers worked as a security advisor for AT&T and a risk analyst for Nokia (a Finnish company) while those companies had loose ties to the Chinese telecom company Huawei.

Rogers has defended his business dealings since leaving Congress, insisting his record shows he has long fought against Chinese intellectual property theft and other threats to the U.S.

Rogers and Slotkin are running to succeed retiring U.S. Senator Debbie Stabenow.

Michigan’s open U.S. Senate seat could prove pivotal for deciding which party will control the Senate.