A Washington, D.C., law firm that has represented Russian interests and the Republican Party in a fight over Hillary Clinton's emails now is involved in an effort by a mysterious foreign-owned company to avoid complying with a subpoena believed to be related to special counsel Robert Mueller's investigation, a report Wednesday said.

Lawyers from the high-powered firm Alston & Bird have been spotted in recent months at federal court in Washington headed into or out of hearings for the subpoena case, which were closed to the public, CNN reported. The report came a day after The Washington Post reported that the unnamed company in the case is a foreign financial institution.

It is not known if Alston & Bird is representing the company, the country that owns it or regulators for the country, according to the story.

Very few documents related to the case are publicly available.

The Supreme Court now is considering whether to let the company continue to challenge lower court rulings that it must comply with a grand jury subpoena that is believed to be connected to Mueller's probe of Russian interference in the 2016 presidential election.