Sen. Dianne FeinsteinDianne FeinsteinTrump's Democratic tax dilemma Feinstein: Trump immigration policies 'cruel and arbitrary' The Memo: Could Trump’s hard line work on North Korea? MORE (D-Calif.) on Sunday defended former Secretary of State and first lady Hillary ClintonHillary Rodham ClintonAssange meets U.S. congressman, vows to prove Russia did not leak him documents High-ranking FBI official leaves Russia probe OPINION | Steve Bannon is Trump's indispensable man — don't sacrifice him to the critics MORE against questions about her ability to run for president in 2016 after a head injury four years ago.

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Questions about Clinton's health are “not legitimate,” Feinstein said on CNN’s “State of the Union.”

“She’s in the prime of her political life,” Feinstein said, adding that remarks from Republican strategist Karl Rove about Clinton’s health were “stupid.”

Feinstein said Clinton “has all of the elements of a good leader.”

If Clinton were to run and win, “we would have someone in the White House who would have a real background in foreign policy,” said Feinstein, the chairwoman of the Senate Intelligence Committee.

Her committee issued a report in January about the 2012 attack in Benghazi that left four Americans dead and is often tied to Clinton’s tenure as secretary of State.

That report “was bipartisan” and answered questions about the preventability of the attack “to the satisfaction of the intelligence community,” Feinstein said.

House Republicans’ calls for another investigation into the Benghazi attacks are a “hunting mission for a lynch mob,” she added.