Sen. 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.), the top Democrat on the Senate Finance Committee, grew testy with Treasury Secretary Steven Mnuchin Steven Terner MnuchinMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled Hillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers On the Money: Pelosi draws line at .2T | Jobless claims dip | Swing-state jobless numbers an issue for Trump MORE on Wednesday during an exchange over the department's response to information requests.

Wyden criticized Mnuchin for refusing to comply with a request from 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.) for President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE's tax returns, even as Treasury complies with requests for financial records from Senate GOP chairmen. Wyden said the move "looks political."

Wyden did not mention specifics of the GOP probe but appeared to be referring to the investigation from Finance Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleySenate Republicans signal openness to working with Biden Senators offer disaster tax relief bill Trump spikes political football with return of Big Ten season MORE (R-Iowa) and Senate Homeland Security and Governmental Affairs Committee Chairman Ron Johnson Ronald (Ron) Harold JohnsonSecond GOP senator to quarantine after exposure to coronavirus GOP-led panel to hear from former official who said Burisma was not a factor in US policy The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE (R-Wis.) are conducting about Hunter Biden, Burisma Holdings and Ukraine.

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In that investigation, Grassley and Johnson have sought suspicious activity reports (SARs) from Treasury's Financial Crimes Enforcement Network. SARs are reports that financial institutions file about actions that might suggest criminal activity in an effort to help detect and prevent money laundering.

“It looks to me like there’s a double standard here,” Wyden said.

Mnuchin said that he hasn't provided Neal with Trump's tax returns because Treasury has "significant concerns" about the request on the advice of counsel. He said the tax return request is "very different" from requests for SARs.

“On a bipartisan basis, we have responded to thousands of SARs requests to the committees from both Republicans and Democrats,” Mnuchin said.

Wyden appeared to be unsatisfied with Mnuchin's answer, interjecting and saying, "Mr. Secretary, you are stonewalling about stonewalling."

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"That's really not fair at all," Mnuchin replied.

"Two committee chairs, one gets no response, with legal authority, that's the Democrat, the Republican gets a quick response," Wyden said.

Mnuchin said that Treasury has responded to requests from Wyden and others for "thousands of SARs."

Grassley said that his investigation with Johnson "has nothing to do with" tax returns and is proceeding methodically.