"I've watched you for many years, you're an ultra-leftist," Conservative legal activist Larry Klayman said to CNN's Don Lemon Tuesday night on Erin Burnett OutFront.

Klayman came as a guest to discuss his victory, when a federal judge ruled that the National Security Agency's domestic phone surveillance program was likely unconstitutional.

Judge: NSA phone data-mining unconstitutional

The interview started with Klayman slamming Lemon and CNN's Legal Analyst Jeffrey Toobin.

"The NSA has data on all of us, meta-data, which deals with our personal lives - clearly a violation of the four amendment." Klayman added, "But rather than talking about that you got to try to take out somebody who challenged President Obama."

Klayman's interview was preceded by a piece on the tea party activist's history of litigating cases against the United States government.

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"The idea that Larry Klayman is the representative -  is simply outrageous, because he's a professional litigant and lunatic," Toobin said.

Toobin argued that the important issues of the NSA phone surveillance case shouldn't be represented by 'Klayman's tin foil hat paranoia about the NSA being after him.'

The conversation continued to be confrontational - leading to Lemon calling for Klayman to removed from the discussion.

Watch the video clip in this post to discover how the interview ended.