Carter said Hillary did little for peace, and praised John Kerry's tenure at State.
Administration failed for years to report on companies that might have violated sanctions.
U.S. Air Force Gen. Philip Breedlove, NATO's top military commander in Europe, opened the door Wednesday to deploying U.S. troops to Eastern Europe to counter Russian moves.
Senate Republicans on Wednesday said they would keep pressing for answers from the Obama administration on the Benghazi terrorist attack on Sept. 11, 2012, hours after House Democrats urged them to "get past the Benghazi witch-hunt."
"I don't think we're doing enough — I think we should be sharing more [intelligence]," said Rep. Adam Schiff (D-Calif.), who recently came back from a visit to Ukraine. This week, pro-Russian demonstrations provoked fears that President Vladimir Putin might mount a second invasion in Ukraine just weeks after annexing Crimea.
Gen. Philip Breedlove would not "write off involvement by ... the United States."
Lawmakers want to help Ukrainian forces defend themselves against a Russian invasion.
On Tuesday, the secretary of State seemed to blame Israel for a recent impasse.
In previous interviews, Clinton has refrained from criticizing Snowden.
Hagel announced earlier this week that the United States will deploy two additional ballistic missile defense ships to Japan.