The Justice Department has launched a new investigation into allegations the Clinton Foundation used "pay to play" politics while Hillary Clinton was U.S. secretary of state, Fox News has confirmed.

A source familiar with the investigation told Fox News late Thursday the investigation is being led by the U.S. Attorney’s office and the FBI in Little Rock, Ark.

Fox News also has learned investigators are looking into whether the Clinton Foundation violated tax law. Accusers of "pay to play" have claimed the foundation promised favors in exchange for donations or pledges of cash or gifts.

The Hill, which broke the story Thursday evening, added that FBI agents have taken the lead in the investigation and have interviewed at least one witness in the last month.

The witness said that agents inquired specifically about donations to Clinton entities and official government actions during Clinton's leadership of the State Department under President Obama, according to the Hill.

The Hill reported that law enforcement officials said there will be "additional activities" relating to the investigation in the coming weeks.

Spokespeople for Hillary Clinton and the Clinton Foundation did not immediately respond to Fox News' request for comment.

Late last year, Attorney General Jeff Sessions told prosecutors to evaluate “certain issues” raised by congressional Republicans cocerning alleged unlawful dealings related to the Clinton Foundation, leading to speculation about the potential appointment of another special counsel.

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