Sen. Ron Wyden Ronald (Ron) Lee WydenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (Ore.), the top Democrat on the Senate Finance Committee, announced on Wednesday that he is placing a hold on Treasury Department nominees, arguing that the department has not sufficiently responded to his requests for information about its handling of Democrats' request for President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's tax returns.

“Congress has a constitutional obligation to conduct oversight of the executive branch, so I am placing a hold on Treasury Department nominees," Wyden said in a statement, which came two weeks after he had threatened to place the hold.

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In particular, Wyden said that Brent McIntosh, Trump's nominee to be Treasury undersecretary for international affairs, should not receive a hearing until Wyden receives answers to his information requests.

McIntosh is currently general counsel for Treasury, and his office has been involved in discussions about the request for Trump's tax returns.

"Mr. McIntosh was central to the Treasury Department’s decision making and without additional context on the process, committee members will not be able to ask informed questions," Wyden said.

House Ways and Means Committee Chairman Richard Neal Richard Edmund NealPelosi asks panels to draft new COVID-19 relief measure AARP endorses Democrats' measure to overturn Trump payroll tax deferral Pelosi, Democrats unveil bills to rein in alleged White House abuses of power MORE (D-Mass.) has issued letters and subpoenas demanding six years of Trump's tax returns from the IRS. He cited a provision in the tax code that states that the Treasury secretary "shall furnish" returns requested by the chairmen of Congress's tax committees.

Treasury Secretary Steven Mnuchin Steven Terner MnuchinOn The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Vulnerable Democrats tell Pelosi COVID-19 compromise 'essential' Pelosi asks panels to draft new COVID-19 relief measure MORE rejected the request and subpoena, arguing that they don't have a legitimate legislative purpose. Both Neal and Mnuchin expect the dispute to eventually be resolved in the courts.

Wyden in May sent letters to Mnuchin and IRS Commissioner Charles Rettig, asking them about Treasury and IRS communications related to Neal's request, including communications made before Neal's initial request in anticipation of it. Earlier this month, Wyden sent another letter to Rettig, asking for information about a draft IRS memo prepared last fall that found that the agency had to comply with congressional tax committees' requests for returns unless executive privilege was invoked.

Treasury responded to Wyden's May letter to the department by saying that Neal's request was different than past congressional requests for tax returns, and by sending Wyden copies of Mnuchin's past correspondence with Neal and an annual report that the IRS prepares for the Joint Committee on Taxation about requests for tax return information. The IRS did not respond to Wyden's June 4 letter to the agency by the senator's June 11 deadline.

“In letters to Secretary Mnuchin and Commissioner Rettig, I asked a number of questions about compliance with congressional requests for tax return information. They included basic inquiries about whether the treasury secretary has been involved in compliance before and when political appointees learned of a memo prepared in advance of an expected congressional request for tax return information," Wyden said in a statement. "I have received non-answers or no response at all, which is completely unacceptable."

Wyden had also put a hold on Trump Treasury nominees in the past because he felt like the department was stonewalling his information requests.

For example, he had put a hold on Trump's nomination of Justin Muzinich to be deputy Treasury Secretary last summer but then lifted that hold in November after Treasury cooperated with several of his information requests. Muzinich was confirmed in December on a mostly party-line vote.