Continued from page 1

For its part, GreenTech said in a recent statement that the company is fully cooperating with the requests for information from the Securities and Exchange Commission and that it believes the company “is in full compliance with all applicable laws and regulations.”

The SEC is looking into whether GreenTech guaranteed returns for its investors.

Mr. Holsworth said the GOP is trying to cast doubts about Mr. McAuliffe, but it also is working to damage Mrs. Clinton’s brand in the middle of a race where she could be a valuable surrogate for Democrats.

“I’m not sure yet whether it resonates for voters,” he said. “We have to see how this plays out.”