The Treasury Department’s internal watchdog is planning to investigate the "opportunity zones" program after three Democratic lawmakers called for a closer look at the initiative, acting Treasury Inspector General Richard Delmar told NBC News.

Delmar’s announcement came a few months after Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.), Rep. Emanuel Cleaver (D-Mo.) and Rep. Ron Kind Ronald (Ron) James KindWisconsin Rep. Ron Kind wins primary Democrats exit briefing saying they fear elections under foreign threat Bottom line MORE (D-Wis.) sent him a letter requesting an investigation after news reports indicated that friends of the administration were benefiting from the program. The acting inspector general told NBC News that the report is expected to be completed by early spring.

The opportunity zone program was enacted with President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE’s tax bill in 2017 and was designed to give tax incentives to those who invest in designated lower income areas.

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But The New York Times reported last year that Treasury Secretary Steven Mnuchin Steven Terner MnuchinLawmakers fear voter backlash over failure to reach COVID-19 relief deal United Airlines, unions call for six-month extension of government aid House Democrats plan to unveil bill next week to avert shutdown MORE told the department to grant Storey County, Nevada, an opportunity zone status, a decision that came after he spent time with the co-owner of a company in that county.

House Ways and Means Committee Chairman Richard Neal Richard Edmund NealRep. Cedric Richmond set to join House Ways and Means Committee Coons beats back progressive Senate primary challenger in Delaware Pelosi: House will stay in session until agreement is reached on coronavirus relief MORE (D-Mass.) and Senate Finance Committee ranking member Ron Wyden Ronald (Ron) Lee WydenGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high Republican Senators raise concerns over Oracle-TikTok deal Hillicon Valley: TikTok, Oracle seek Trump's approval as clock winds down | Hackers arrested for allegedly defacing U.S. websites after death of Iranian general | 400K people register to vote on Snapchat MORE (D-Ore.) also sent a letter to Mnuchin in November asking for more information on why that county was selected after the department had previously decided it was ineligible.

The Treasury Department has pushed back on the story, saying officials only reconsidered the opportunity zone designation for the county at the request of local officials and that Mnuchin did not know of the investments in the county.

Other Democrats sent a letter to the Government Accountability Office asking the office to look into a number of aspects of the program, including analysis on how the opportunity zones were decided.

The department and the IRS also released a draft form to gather information about investments made under the program as they faced scrutiny in October. NBC reported that as of January, $7 billion in investments were made in the program, according to data collected by accounting firm Novogradac.

The department did not immediately return a request for comment.