Democratic Whip Steny Hoyer (Md.) and six ranking members on Tuesday urged the administration to brief Congress on Russian interference in the U.S. election.

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“We are gravely concerned that Russia may have succeeded in weakening Americans' trust in our electoral institutions through their cyber activity,” the lawmakers wrote in a letter to President Obama.

Specifically, they requested a classified briefing providing details regarding “Russian entities' hacking of American political organizations; hacking and strategic release of emails from campaign officials; the WikiLeaks disclosures; fake news stories produced and distributed with the intent to mislead American voters; and any other Russian or Russian-related interference or involvement in our recent election.”

The request comes as Senate Democrats are also keeping up their pressure on the Obama administration to make more information public about alleged Russian meddling in the U.S. election.

"We believe there is additional information concerning the Russian Government and the U.S. election that should be declassified and released to the public," a group of Intelligence Committee Democrats led by Sen. Ron Wyden (Ore.) wrote in a brief letter to President Obama on Wednesday. "We are conveying specifics through classified channels."

In October, the intelligence community publicly blamed Russia for the hack of the Democratic National Committee (DNC) and other political organizations this year, calling the thefts an intentional effort to interfere with the U.S. election process.

Officials stopped short of blaming Russian hackers for the probing of state election systems. Director of National Intelligence James Clapper, though, has since said Russian scanning of state election infrastructure was "curtailed" after that statement.

Democrats have characterized the release of the DNC emails as an attempt to bolster Donald Trump's bid for the White House and have pointed to the president-elect's warm remarks about Russian President Vladimir Putin.

Despite Trump's election, Democrats are not easing their pressure.

Sen. Jeanne Shaheen (D-N.H.) has also urged the Senate Foreign Relations Committee to hold a hearing probing the implications of Russian interference in the election.

"These Russian actions are unprecedented in our post-Cold War relationship and have rightfully drawn bipartisan condemnation and prompted bipartisan calls for Congressional hearings," she wrote.

Shaheen added that a hearing could be paired with a closed-door briefing for lawmakers as they weigh a response to "these unacceptable violations of our democracy."

Trump has fiercely disputed claims that the Russian government was helping his campaign and has declined to blame Russia for the attacks.

Signees of Monday’s letter included House Judiciary Committee ranking member John Conyers (Mich.), Foreign Affairs Committee ranking member Eliot Engel (N.Y.), Homeland Security Committee ranking member Bennie G. Thompson (Miss.), Oversight Committee ranking member Elijah Cummings (Md.), Armed Services Committee ranking member Adam Smith David (Adam) Adam SmithWhen 'Buy American' and common sense collide Overnight Defense: Marine Corps brushes off criticism of Marines' appearance in GOP convention video | US troops injured in collision with Russian vehicle in Syria | Dems ask for probe of Vindman retaliation allegations Democrats press Pentagon watchdog to probe allegations of retaliation against Vindman brothers MORE (Wash.) and Intelligence Committee ranking member Adam Schiff Adam Bennett SchiffChris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (Calif.).