Illustration by Alex Castro / The Verge

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.

At issue is an Amazon executive’s testimony at a hearing last July, where he said the company doesn’t access information from third-party sellers on its platform to make competing items. But the Wall Street Journal reported last month that Amazon employees regularly used information from the sellers to develop the company’s private-label products.

“Members from both parties have serious questions about Amazon’s business practices and its honesty with the Committee,” Nadler tweeted. “We will not permit stonewalling of our investigation, by…

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