More than a half dozen federal departments and agencies backed a proposal to ban future sales of the most popular home routers in the United States on the grounds that the vendor’s ties to mainland China make them a national security risk, according to people briefed on the matter and a communication reviewed by The Washington Post.

The proposal, which arose from a months-long risk assessment, calls for blocking sales of networking devices from TP-Link Systems of Irvine, California, which was spun off from a China-based company, TP-Link Technologies, but owns some of that company’s former assets in China. The ban was proposed by the Commerce Department and supported this summer by an interagency process that includes the Departments of Homeland Security, Justice and Defense, the people sa

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