"Based on media reports I have seen and briefings I have received, I can only conclude that the Russian government is attempting to interfere in our election with the goal of electing Donald Trump," the California Democrat said in a statement.

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Feinststein, the ranking member of the Senate Intelligence Committee, pointed to recent hacks of political groups and Clinton campaign chairman John Podesta's email, as well as "other faked documents."

"[They] are clear efforts to discredit the Clinton campaign and represent yet another unacceptable step in what appears to be an attempt by the Russians to fix this election," she added. "Every elected official and candidate in the United States, including Trump, should vocally and forcefully reject these efforts."

The Obama administration publicly blamed Russia for the hack of the Democratic National Committee (DNC) and other political organizations this year. The Wall Street Journal reported Thursday that the FBI also suspects that Russian intelligence agencies are behind the hack of Podesta's email.

Feinstein added Thursday that the Obama administration should be "prepared to take forceful action" if Russian President Vladimir Putin doesn't stop the hacking.

“I agree with the Director of National Intelligence and the Secretary of Homeland Security that only the senior-most government officials in Russia could have ordered this effort," she said. “Americans should not and will not stand for these illegal and illegitimate attempts by the heirs of the KGB to corrupt our election system.”

White House press secretary Josh Earnest said earlier this week that the administration will take a "proportional" response to the recent spate of Russia's stateside hacking, and implied that the move would not be public.

Sergey Lavrov, Russia's foreign minister, brushed aside the administration's threats, telling CNN "if they decide to do something let them do it."