As Gupta spoke on the controversy surrounding sacked Minister Sandeep Kumar's sleaze CD, Chauhan intervened and was heard shouting at him.
A furious Gupta immediately staged a walkout alleging he was threatened by Chauhan. "I will complain to the police immediately," he said while storming out.
Later, Deputy Chief Minister Manish Sisodia said Gupta was deliberately evading the discussion and urged Speaker Ram Niwas Goel to initiate contempt of House proceedings against him if he takes up an internal issue of the Assembly with the police.
The Speaker also read out a statement where he said that he "wants the police" not to take any action pertaining to anything that happened inside the House.
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"I am submitting the issue of contempt proceedings as raised by the Deputy CM to the House Committee," Goel said.
Gupta said he had every right to do so as his "life was under threat".
"The Speaker did not take any action against Chauhan while Deputy CM Sisodia indirectly supported him forcing me to call the police," he said.
"As you and all the ministers and MLAs present in the House are a witness that during the discussion around 7.40 PM, I was threatened by Chauhan that he will kill me by cutting into pieces. Therefore, it is apprehended that there is serious threat to my life," Gupta said in his letter.