The investor wanted to meet with Clinton.

years of Clinton calendars do not show any meetings with Neptune’s executives or investors. But after Clinton told a senior State Department offifficial to look into the request, the offifficial responded: “I’ll get on it.”

A campaign spokesman and a spokesman for the hedge fund where Mezvinsky is a co-partner declined to comment.

In a letter to the ethics agency’s director, Walter Shaub, FACT Executive Director Matthew G. Whittaker cited federal ethics rules that government offifficials should not accord preferential treatment while performing offifficial duties and from acting to benefifit someone based on personal or business relationships.

The episode began with a May 2012 email to Mezvinsky from Harry Siklas, a friend and former Goldman Sachs co-worker. Siklas said an executive with Neptune, a Florida fifirm he had invested in, was seeking to meet with Clinton or other State Department offifficials to discuss the fifirm’s ocean mining interests. Clinton had recently pressed for the Senate passage of the Law of the Sea Treaty, which would have enabled the U.S. to sponsor mining fifirms involved in deep-sea scouring for minerals. The Senate has yet to approve the treaty.

A Clinton email chain released earlier this month does not show any reply from Mezvinsky in 2012. But in August 2012, three months after Siklas sent the email to Mezvinsky, Clinton relayed a copy of Siklas’ email to Thomas Nides, then deputy secretary of state for management, who agreed to look into the matter.

Whittaker asked Shaub for “a full investigation into these communications and a determination of whether any laws were broken.”