The top Democrat on the Senate Finance Committee on Thursday threatened to block nominees to the Treasury Department until the Trump administration answers questions about the handling of a Democratic request for the president’s tax returns.

Sen. Ron Wyden Ronald (Ron) Lee WydenDemocrats call for declassifying election threats after briefing by Trump officials Read Democrats' report countering Republicans' Biden investigation Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (D-Ore.) said in a statement that he would place a hold on Treasury nominees if the department did not share a wide array of communications and documents related to Treasury Secretary Steven Mnuchin Steven Terner MnuchinHillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars Treasury: Trump's payroll tax deferral won't hurt Social Security Treasury sanctions individuals, groups tied to Russian malign influence activities MORE’s decision to keep President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s tax returns private.

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“If the Treasury Department refuses to answer our questions, I am prepared to again place a hold on department nominees as I did previously when routine requests for information went unanswered,” Wyden said.

“Congress needs to take action to force the administration to comply with oversight.”

Senators occasionally place holds on nominees who they find highly problematic, or to extract concessions. A hold prevents the Senate from quickly confirming the nominee.

Wyden, the ranking Democrat on the Senate panel overseeing Treasury, is seeking information from the department on Mnuchin's decision to decline a House Democratic request for Trump’s tax returns.

House Ways and Means Committee Chairman Richard Neal Richard Edmund NealAARP endorses Democrats' measure to overturn Trump payroll tax deferral Pelosi, Democrats unveil bills to rein in alleged White House abuses of power Rep. Bill Pascrell named chair of House oversight panel MORE (D-Mass.) on April 3 requested six years of Trump's personal and business tax returns from the IRS. After a series of delays, Mnuchin told Neal in a May 6 letter that he would not comply with the request after consulting with the Department of Justice.

Neal then sent subpoenas for the returns to Mnuchin and IRS Commissioner Charles Rettig, which are likely to spawn a lengthy court battle.

In a May 14 letter, Wyden asked Mnuchin for copies of emails, memorandums and other communications detailing how Mnuchin came to his decision.

Wyden also asked Mnuchin for information on how the IRS handled previous congressional requests for tax returns, under section 6103(f) of the tax code, the same provision Neal cited in his request for Trump’s returns. That section states the Treasury secretary "shall furnish" tax returns requested by the Senate Finance or House Ways and Means committees.

In a Wednesday letter to Wyden, the Treasury Department only handed over copies of Mnuchin’s previous correspondence to Neal and a report on requests for returns under 6103 in 2018.

Wyden called the reply “unresponsive and wholly unacceptable.”