A senator is pushing the Justice Department to open a criminal antitrust investigation into Amazon.com Inc. after a Wall Street Journal report detailed the company’s use of third-party seller data to develop its products.

In a letter addressed to Attorney General William Barr, Sen. Josh Hawley (R., Mo.) urged the Justice Department to probe Amazon’s business practices, saying recent reports suggest the company “has engaged in predatory and exclusionary data practices to build and maintain a monopoly.” Mr. Hawley said the department…

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