A Friday letter from Amazon to members of Congress looking into the company’s third-party seller practices was’unacceptable’. House Judiciary Committee chairman Jerry Nadler (D-NY) tweeted Saturday that a letter from the company was written to Congress. The letter was written by the House Judiciary chair Jerry Nadler.

An Amazon executive said the company does n’t access information from third-party sellers on its platform to make competing items. The Wall Street Journal reported last month that Amazon employees regularly used information from the sellers to develop the company’s private-label products.

‘we will not permit stonewalling of our investigation, by Jeff Bezos or anyone,’ Nadler tweeted.

Vice President of public policy Brian huseman wrote that the company was’prepared to make the appropriate Amazon executive available,’ but did not mention Bezos. huseman also added that the firm was investigating the claims made in the WSJ article.

The letter was addressed to Nadler and members of the house antitrust subcommittee.’we disagree strongly with any suggestion that we have attempted to mislead the committee or not been cooperative with the investigation,’ huseman wrote.

Members of Congress have threatened to subpoena Bezos. Rep. DAVID cicilline, chairman of the antitrust subcommittee, repeated the idea in a Tweet on Friday.