Sen. Ron Wyden Ronald (Ron) Lee WydenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Ore.) condemned Republicans on the Federal Election Commission (FEC) after they voted on Friday to block an in-depth investigation into allegations that Russians illegally donated to the National Rifle Association (NRA) in an effort to benefit President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's 2016 presidential campaign.

"A foreign adversary interfered in the 2016 presidential election and the response from Republicans at every level, whether it be President Trump, congressional Republicans, or now the Republican appointees on the Federal Election Commission, has been to bury their heads in the sand or actively obstruct getting to the bottom of what happened," Wyden said in a written statement provided to Newsweek.

"It's inexcusable that Republican commissioners would block an investigation into whether Russian money was funneled through the National Rifle Association to help President Trump," Wyden continued, according to Newsweek. "The blatant partisanship is appalling, undermines our democracy and leaves us vulnerable to continued interference in 2020."

In March 2018, the FEC launched a preliminary investigation into allegations that Alexander Torshin, a Russian banker and former politician with ties to President Vladimir Putin Vladimir Vladimirovich PutinWatchdog confirms State Dept. canceled award for journalist who criticized Trump Former intelligence agency director Robert Cardillo speaks out against 'erratic' Trump Kremlin: Putin calls for reset between US and Russia on cyber relations before elections MORE, and Maria Butina Maria ButinaTreasury adviser pleads guilty to making unauthorized disclosures in case involving Manafort Recently jailed Maria Butina rewarded with new show on Russia Today Russia offers Maria Butina a job at human rights commission MORE, who admitted to working as a Russian agent to infiltrate the NRA, made illegal donations to the NRA in an effort for those donations to support Trump's presidential bid.

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The NRA and its lobbying arm spent a total of $30 million in the 2016 election to support Trump.

On Friday, the FEC deadlocked in a 2-2 vote, failing to find a reason to believe Torshin and Butina made illegal donations and deciding not to take action to investigate the allegations.

FEC Chairwoman Ellen Weintraub also criticized the vote on Friday, saying the FEC was doing "nothing to find out the truth behind one of the most blockbuster campaign finance allegations in recent memory."

BREAKING: @FEC's Republicans block all investigation of & enforcement against Russians Torshin & Butina re the NRA & the 2016 presidential election.



Result: FEC does nothing to find out the truth behind one of the most blockbuster campaign finance allegations in recent memory. pic.twitter.com/KgrJLJTuZY — Ellen L Weintraub (@EllenLWeintraub) August 16, 2019

Commissioner Caroline C. Hunter defended FEC Republicans in a statement to Newsweek, saying it is "forbidden from investigating groups purely based on rank speculation."

"Once again, Chair Weintraub rejected the advice of the FEC's lawyers but blames her Republican colleagues. Her statement is long on conjecture and short on the evidence and the law. She relies on an 'article' [published by] McClatchy written by the same individuals who inaccurately reported Michael Cohen Michael Dean CohenAppeals court appears skeptical of Trump's latest argument against tax returns subpoena Judge orders Eric Trump to comply with New York AG's subpoena before Election Day A huge deal for campaign disclosure: Trump's tax records for Biden's medical records MORE was in Prague in 2016. The FEC is forbidden from investigating groups purely based on rank speculation."

Earlier this year, the gun control group Giffords filed a lawsuit against the FEC for not taking action on the investigation. The NRA dismissed the lawsuit and allegations of illegal campaign contributions, telling The Washington Post they "scrupulously follow the law."

“We scrupulously follow the law,” an NRA spokeswoman told The Post at the time. “This latest effort by Giffords and the Campaign Legal Center is a frivolous lawsuit based on a frivolous complaint.”

The Hill has reached out to the NRA and FEC for comment.