Washington (CNN) Rep. Maxine Waters, a Democrat of California, on Tuesday said that President Donald Trump should be put in "solitary confinement" because "impeachment is not good enough" after House Democrats launched an impeachment inquiry against the President last week amid the mounting Ukraine controversy.

"I'm calling on the GOP to stop Trump's filthy talk of whistleblowers being spies & using mob language implying they should be killed," Waters tweeted. "Impeachment is not good enough for Trump. He needs to be imprisoned & placed in solitary confinement."

"But for now, impeachment is the imperative," she added.

Speaking to CNN's Anderson Cooper on "Anderson Cooper 360" Wednesday night, Waters stood by her tweet and maintained that focus should remain on Trump's actions.

"Most people who have watched me over the past two years know that I am a responsible person who has talked about the Constitution, who has talked about the fact that this President does not respect the fact that (Russian President Vladimir) Putin is responsible for basically bugging our electoral system, hacking into the DNC. They know that I've been serious about this. I've had the courage to stand up when nobody else would stand with me," Waters said.

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