"It's not because there is some new evidence that has come to light," Rep. Adam Schiff (D-Calif.) said of the FBI's reported investigation into the Clinton Foundation. | AP Photo Schiff: 'We have a seriously flawed human being in the Oval Office'

The ranking Democrat on the House Intelligence Committee said Sunday that virtually every member of Congress has concerns about President Donald Trump's mental state, even if they won't say so publicly.

"I don't think there is anyone in Congress, frankly, of either party who does not concur at least privately with those observations and concerns," Rep. Adam Schiff of California said on CNN's "State of the Union." "Certainly, very few are willing to express them publicly in Congress, and I think that's to the detriment of our institution.


"The big question for us, though," he added, "is, you know, plainly, we have a seriously flawed human being in the Oval Office."

Schiff also said the FBI's reported investigation of the Clinton Foundation was politically motivated.

"If they are investigating Hillary Clinton, it doesn't take a genius, let alone a stable genius, to see why," Schiff said, mocking Trump's assessment of his own mental state.

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"It's not because there is some new evidence that has come to light," Schiff said. "It's because they're being badgered by the White House to do it. You simply cannot explain it, I think, any other way."