Yates had been called to testify after reports she'd warned White House officials that former national security adviser Michael Flynn has compromised through communications with Russians.
News outlets previously reported that Flynn discussed USA sanctions with a Russian ambassador before Trump took office.
White House Press Secretary Sean Spicer on Tuesday dismissed former acting Attorney General Sally Yates as President Trump's "political opponent".
His aides are engaging in real-time political combat with Mr Trump, including revealing on Monday that Mr Obama personally warned his successor against hiring embattled Michael Flynn as his national security adviser.
Flynn, a retired general, has emerged as a central figure in probes into allegations of Russian meddling in the 2016 U.S. election and possible collusion between Trump's campaign and Moscow. She was also asked about her own dismissal after she refused to sign off on Trump's first travel ban, which has since failed to get approval from the courts. "He stands by it", Spicer told reporters.
The real news is that neither Yates nor Clapper had any direct proof of Russia-Trump campaign collusion. With the growing connections to Russian Federation among Trump administration officials, we can only wonder who will be next.
Trump fired Yates Jan. 30 after she said the Justice Department would not defend the president's proposed travel ban.
Former acting attorney general Sally Yates, a Barack Obama appointee who was sacked by Trump early in his presidency, made the disclosure during hotly-anticipated testimony before the Senate Judiciary Committee on Monday. Stolen emails to and from top Democratic Party officials, including then-DNC chairwoman Debbie Wasserman Schultz, were released to the public last summer on the secret-sharing website WikiLeaks, followed in the fall by the hacked messages of John Podesta, the campaign chairman of Democratic presidential candidate Hillary Clinton.
As Yates, deadpanning, put it: "You don't want your national security adviser compromised with the Russians".
Flynn spoke with Kislyak in December, just before and after the Obama administration slapped new sanctions on Russian Federation for its cyber attacks during the presidential campaign.
During that time, Flynn was the most senior national security official in the West Wing, privy to every intelligence and foreign policy decision and secret, all the while, at risk of being blackmailed by Moscow, according to Yates.
Trump's positive comments about Russian leader Putin both before and after he assumed office as President of the United States have caused additional concerns.
She said she was briefing the Trump White House so that officials could take "the action that they deemed appropriate" and that she believed the Russians already had the same information. James Clapper, director of national intelligence under Obama, also testified Monday.
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