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.) said Wednesday that he's placed a hold on President Trump's pick to oversee the administration's sanctions policy, adding that he'll only lift the hold if the Treasury Department provides documents about the financial ties between Russia and Trump associates.

"I have stated repeatedly that we have to follow the money if we are going to get to the bottom of how Russia has attacked our democracy. That means thoroughly review any information that relates to financial connections between Russia and President Trump and his associates," Wyden said in a statement.

He added that Sigal Mandelker, Trump's choice to be the Treasury undersecretary for terrorism and financial crimes, will be "responsible for much of this information."

Using the "hold" allows Wyden to slow down the nomination process.

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Wyden said that he will maintain his hold on Mandleker's nomination until the Treasury Department gives the Senate Intelligence and Finance Committees "information and documents related to Russia and its financial dealings" related to President Trump and aides.

Wyden sits on both committees.

The leaders of the Senate Intelligence Committee sent a request earlier this month to the Treasury Department's financial crimes unit for similar information.

Warner told CNN at the time that he wouldn't support Mandelker's nomination until the committee received the information.

"Until we get it, I'm not going to support the administration's nominee for undersecretary of Treasury finance, for terrorism and finance, because they owe us these documents first," Warner said.