The Justice Department is set to release a report next week that lays out how much Special Counsel Robert Mueller has spent on the investigation into Russian interference in the presidential campaign.

According to The Hill, the report will be made public and sent to Congress.

The document will provide the first insight into how much Mueller has spent on a sprawling investigation that is looking at Russia’s meddling in the presidential campaign as well as the activities of Trump campaign officials. Mueller is also investigating the business dealings of former Trump advisers, including campaign chairman Paul Manafort and former national security adviser Michael Flynn.

Mueller indicted Manafort last month and secured a plea deal from former Trump campaign adviser George Papadopoulos for lying to the FBI about contacts he had with Russians during the campaign. A former FBI director, Mueller is also keying in on Flynn’s consulting work last year for the Turkish government.

Mueller’s expansive investigation has led to grumbling from some Republicans that he has gone beyond his initial mandate of looking into Russian interference and possible Trump campaign collusion.

Mueller was appointed special counsel on May 17, a week after Trump fired James Comey as FBI director. He has since assembled a team of 17 all-star prosecutors, many with counterintelligence and money laundering experience.

As The Hill notes, special prosecutors are required to release expense reports every six months.

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