Sen. Dianne Feinstein Dianne Emiel FeinsteinSenators offer disaster tax relief bill Democrats back away from quick reversal of Trump tax cuts Congress must save the Postal Service from collapse — our economy depends on it MORE (D-Calif.) urged President Trump on Sunday to stop tweeting, with her comments coming amid a growing investigation into Russian ties to the Trump campaign.

“I’d really like to say it meaning well. And that is: stop the tweeting. Think about what you say. Because you’re reflecting in a big pool,” Feinstein said on CBS’s "Face the Nation."

The top Democrat on the Senate Judiciary Committee went on to say that the unpredictability of Trump’s Twitter habits have an effect on the workings of Congress.

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“The Senate and the House have to feel a sense of stability from day to day. We can’t feel the anxiety that goes with not knowing what may happen next, what may be said next,” she said.

“We need to depend on our president for truth. That is really important.”

The California senator also defended former FBI Director James Comey against Trump’s claim that he is “a nut job.”

“This is a horrible thing for a president to say. Former Director Comey is no way, shape, or form a nut job,” Feinstein said.

Trump tweeted Thursday he was the victim of the greatest witch hunt in American history after the appointment of special counsel Robert Mueller to the federal investigation into ties between the Trump campaign and Moscow, as well as Russian election meddling.

This is the single greatest witch hunt of a politician in American history! — Donald J. Trump (@realDonaldTrump) May 18, 2017

After he fired former FBI Director James Comey, Trump took to Twitter and suggested there were tapes of their private conversations

James Comey better hope that there are no "tapes" of our conversations before he starts leaking to the press! — Donald J. Trump (@realDonaldTrump) May 12, 2017

Feinstein's comments come a day after Twitter's co-founder Evan Williams told The New York Times the social media's role in electing Trump was "bad."