Walmart was sued on Thursday by a former executive who accused the largest US retailer of ignoring problems he uncovered in its e-commerce business, amid growing pressure from Amazon and firing him in retaliation for his complaints.

The plaintiff, Tri Huynh of Washington state, is seeking a variety of damages in his whistleblower lawsuit with the US District Court in San Francisco.

Huynh accused Walmart of betraying founder Sam Walton’s “key principles of integrity and honesty” in a rush to “win the e-commerce war at all costs,” and “silence” people who got in the way. He said he was fired under false pretenses in January 2017.

Walmart had no immediate comment.