Anthony Scaramucci. OneWire Sen. Ben Cardin of Maryland on Thursday told President-elect Donald Trump's nominee for Treasury secretary that he would push for an investigation into Trump adviser Anthony Scaramucci for possible violations of sanctions against Russia.

During a confirmation hearing for the nominee, Steven Mnuchin, Cardin said he planned to send a letter from himself and Sen. Elizabeth Warren of Massachusetts to the Treasury asking for an investigation into Scaramucci and his fund.

Scaramucci is a cofounder of SkyBridge Capital, an investment firm that manages some $12 billion. This week he said he would sell the firm as he prepares to take a role in the White House.

Cardin asked about Scaramucci after Mnuchin said he was "100%" committed to upholding the sanctions against Russia.

"Senator Warner and I are going to be sending you a letter if you are confirmed to investigate the allegations that Mr. Scaramucci, who was recently named as the White House director of engagement and intergovernmental affairs and senior adviser to the president, may very well have violated the sanctions against Russia in his dealings," Cardin said.

Mnuchin said he would "properly investigate" any letter sent to his office regarding the sanctions.

A spokesman for Scaramucci was not immediately available for comment.

Cardin seemed to be referring to a discussion, reported by Bloomberg News, between Scaramucci and the head of a Russian sovereign wealth fund that the US government sanctioned in 2015.

According to Bloomberg, Scaramucci and the fund's director, Kirill Dmitriev, spoke about possible co-investment opportunities. Bloomberg reported that the meeting took place at the World Economic Forum conference in Davos, Switzerland, on Tuesday and was confirmed by Scaramucci.

During an interview with Bloomberg TV — in which the sanctions against Dmitriev's fund were not directly brought up — Scaramucci said he had known Dmitriev for a while and was unsure whether he could continue to contact the Russian investor once he got into the administration.