The special counsel has hired a small army of attorneys - 17 - to work the investigation.
With no end in sight, Special Counsel Robert Mueller's office revealed the cost to USA taxpayers thus far for the Russian Federation collusion investigation.
Mueller incorporated several active investigations within the Justice Department including those of Trump campaign contacts with Russian Federation, former Trump campaign chairman Paul Manafort's business activities and former national security adviser Michael Flynn.
That figure "approximates expenditures the components would have incurred for the investigations irrespective of the existence of the SCO", the report states.
The spending, compiled by Mueller's office, was released by the Justice Department on Tuesday and covers the period from May 17 through September 30.
According to Mueller's report, the special counsel's office spent about $1.7 million for salaries and benefits and more than $223,000 for travel-related expenses.
Equipment acquisitions marks the second-highest expense, coming in at more than $733,000, followed by costs for rent and utilities, travel and transportation, and contractual services.More news: Gardai issue snow and ice warning as national alert remains in place
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Special counsel Robert Mueller spent $3.2 million over that time.
The special counsel investigation run by Robert Mueller has cost taxpayers more in four months than what the investigation into the Benghazi terrorist attack cost in over two years. Starr's sprawling investigation, which led the House to impeach Clinton for perjury, contributed to Congress letting a law that gave special investigators wide independence expire in 1999. A Senate vote in February 1999 failed to convict Clinton on those charges.
"We don't talk about criminal investigations while they're ongoing, so what the American people will see is only if and when a case is charged", he said.
Though Flynn already admitted that other top transition officials - including Jared Kushner, the president's son-in-law, and K.T. McFarland, who is now nominated to be the USA ambassador to Singapore - were aware of his Russia-related dealings, Mueller is likely to want to talk to him about a wider range of topics, including whether Trump obstructed justice and tried to short circuit the probe.
Manafort was charged, along with his longtime business partner Rick Gates, for work on behalf of Ukraine unrelated to the campaign.
The budget overview notes that its funding comes from a "permanent, indefinite" appropriation for independent counsels to do their work, meaning if can not be touched by Congress.
In a statement, the special counsel's office said it will release a similar expenditure report after March 31, 2018.