Warren sent a letter on Wednesday to Treasury Secretary Steve Mnuchin about Anthony Scaramucci and his reported meeting with Kirill Dmitriev, head of the sanctioned Russian Direct Investment Fund.

"Any conduct of current or former Trump administration officials that appear to be an attempt to circumvent or override U.S. sanctions on Russia must be thoroughly investigated," she wrote in the letter.

"I ask that you provide me with a briefing on the status of this investigation at the earliest possible opportunity."

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Warren added on Wednesday that Mnuchin responded to their letter, pledging to take potential violations of current Russia sanctions seriously and ensuring "the appropriate Department components assess whether further investigation of this matter is warranted."

Bloomberg reported last month that Scaramucci met with Dmitriev in Davos, Switzerland.

Warren and Cardin asked at the time if Scaramucci violated the sanctions law or if he advocated or pledged that Trump would eliminate current U.S. sanctions, as well as if any other transition officials were aware of or approved of his activities.

"I write to emphasize that the Department must vigorously pursue this investigation regardless of Mr. Scaramucci's employment status with the Trump administration," Warren added on Wednesday.

Scaramucci was picked to be Trump's director of the Office of Public Engagement and Intergovernmental Affairs. Bloomberg reported earlier this month that the White House was trying to find him another position because he hadn't been cleared by the Office of Government Ethics.