Three Senate Democrats on Monday requested documents from the Treasury Department related to financial ties between the National Rifle Association (NRA) and an alleged agent of the Russian government.

Democratic Sens. 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 (Ore.), Bob Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (N.J.) and Sheldon Whitehouse Sheldon WhitehouseFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Hillicon Valley: Murky TikTok deal raises questions about China's role | Twitter investigating automated image previews over apparent algorithmic bias | House approves bill making hacking federal voting systems a crime House approves legislation making hacking voting systems a federal crime MORE (R.I.) requested copies of all documents that outline Maria Butina’s connections to the NRA in a Monday letter 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.

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Butina, a Russian national and gun-rights activist, was

arrested and charged last week

with secretly acting to advance the Kremlin’s interests through cultivating connections with powerful groups and individuals close to the Republican Party.

Butina is also a former assistant to Alexander Torshin, a deputy governor of the Central Bank of Russia that Democrats on the Senate Judiciary Committee say potentially funneled Russian money into 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 2016 campaign through the NRA.

In their letter, Wyden, Menendez and Whitehouse cite charges from U.S. prosecutors that Butina “engaged in a years-long conspiracy to work covertly in the United States as an undeclared agent of the Russian Federation in order to advance the interest of her home country.”

The senators asked Mnuchin for all records relevant to financial connections between the NRA and Butina, including groups affiliated with the NRA, a pro-gun rights groups Butina opened and a shell corporation Butina created with political operative Paul Erickson.

The Democrats also renewed a previous request from Wyden for similar records regarding the NRA and Torshin, who was sanctioned by the Treasury Department for his close relationship with Russian President Vladimir Putin.

The Justice Department said Butina “worked at the direction of a high-level official in the Russian government who was previously a member of the legislature of the Russian Federation and later became a top official at the Russian Central Bank.”

Wyden, Menendez and Whitehouse say the unnamed official “clearly matches the description of Mr. Torshin."

Butina is latest figure to emerge in sprawling investigation into Russia's efforts to influence the 2016 presidential election, including possible connections to Trump and his campaign. Butina was arrested three days after special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE indicted 12 Russian intelligence officers in the 2016 hacking of the Democratic National Committee.