Senate and House intelligence committee members were given access to Treasury Department data for their investigations into any collusion between the Russian government and President Trump, including his campaign and corporation.
The committees were given access to the information earlier this week, according to a CNN report released late Thursday.
Democrats have said "following the money" will help them determine if there was any communication or financial payoff between the parties.
A few weeks ago, investigators requested the Treasury's Financial Crimes Enforcement Network send information about transactions related to Trump or Russia.
The financial crimes agency had imposed a $10 million penalty on Trump's Taj Majal Hotel in 2015. The recent request was intended to learn if that incident was related to the campaign or Russia.