Ravi Singh, an Illinois-based political consultant, has challenged a federal law barring foreign involvement in U.S. elections, alleging the provision is unconstitutional. Although Mueller has yet to charge anyone with a direct violation of this law, the federal bar has played a role in his investigation and his team alludes to the statute in several legal filings.

A ruling in Singh’s favor could create more uncertainty with the Mueller investigation and in the greater effort to shield U.S. elections from foreign influence.

“It shows there is a lot of untested ground surrounding the foreign national prohibition,” said Joe Birkenstock, a former Democratic National Committee general counsel now with law firm Sandler Reiff.

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