Four leading U.S. Senators, two each from the Republican and Democratic parties, released a joint statement on Sunday saying that Russian interference in November's election cannot be rendered a partisan issue, Politico reports.
The statement was published by Democratic leader Chuck Schumer of New York, Jack Reed (D-R.I.), Armed Services Committee Chairman John McCain (R-Ariz.) and Lindsey Graham (R-S.C.)
This comes after a CIA report concluded Russia meddled with the election in favor of Trump, per a Washington Post report.
The report was dismissed by the Trump campaign and called it "ridiculous" on Sunday.
In an interview on Fox News Sunday, Trump said "they have no idea" who the hacker was.
"Democrats and Republicans must work together... to examine these recent incidents thoroughly and devise comprehensive solutions to deter and defend against further cyber-attacks," the statement reads. "This cannot become a partisan issue."
House Democrats called for an investigation into Russian interference last week. Intelligence experts have long attributed the leak of Democratic National Committee emails to Russian hackers. The memo cited by the Post shows a CIA "consensus" that Russia worked to boost Trump's chances.
WATCH | Graham has long spoken out against alleged Russian interference, telling CNN he would "lead the charge" to investigate Russia's role.
Trump has repeatedly downplayed allegations of Russian involvement. In an interview with Time magazine after winning "Person of the Year," he said he didn't "believe they interfered" and said "it could be some guy in his home in New Jersey."
Earlier this week, Rex Tillerson, CEO of Exxon Mobil and known to have business ties to Russia, was named a leading candidate for Secretary of State.
WATCH | Republican National Committee spokesman Sean Spicer also denied Russian involvement in a CNN interview on Saturday, demanding "proof."
WATCH | On Friday, President Obama ordered a "full review" of election-related hacking, due before he leaves office.