The Department of Homeland Security said it is "aware of cyberbreaches across the federal government."
The cyberattack prompted an emergency response from the U.S. Cybersecurity and Infrastructure Security Agency.
For less than $500,000, Russian President Vladimir Putin got what he most wanted out of the Kremlin's campaign to influence the 2016 U.S. presidential election: a destabilized American democracy and Hillary Clinton out of his hair, U.S. officials say.
Son-in-law and senior adviser Jared Kushner is testifying behind closed doors at the Senate Monday.
Democrats are salivating over the Russian hacking scandal, but it may not help them retake power in Washington.
Russian authorities are asking Western tech companies to allow them to review source code for security products before they're sold in the country.
The Senate sent a strong, bipartisan signal this week it wants more say over President Trump's foreign policies.
While some may have been pushed to "fight against those who speak badly about Russia," the Russian president denied claims that his government has hacked foreign elections.
Relations have been beset by mistrust between the two countries, with Paris and Moscow backing opposing sides in the Syrian civil war and at odds over the Ukraine conflict.
The head of the NSA has said he sees no letup in Russia's attempts to interfere in other countries' elections.
Much of the West's opposition to Russia comes from a purely ideological root.
The Intelligence Committee chairman's withdrawal doesn't fix the investigation or solve the chamber's deeper problems.
Less than five weeks after he took office, the chances of a spring thaw in relations between Washington and Moscow are looking much dimmer, U.S. officials say.
The poll, conducted between Feb. 16 and Feb. 20, shows how President Donald Trump has shifted opinions within the party of Ronald Reagan, where national security has been a top issue since the Cold War.
The letter also asked Sessions, who as attorney general would be the country's top law enforcement official and head of the Justice Department, to commit to not shutting down any investigation into Russia's activities.
The allegations were in a two-page synopsis appended to a report presented by U.S. intelligence officials to Trump and President Barack Obama on Russian interference in the 2016 election, CNN said.
Cyber attacks are not new but might have crossed a "new threshold" this year.