Amazon.com Inc has filed a lawsuit in the U.S. Court of Federal Claims contesting the awarding of an up to $10 billion cloud computing contract to Microsoft Corp by the Pentagon.

According to a spokesman for Amazon, the company has filed a complaint and supplemental motion for discovery under seal.

“The Complaint and related filings contain source selection sensitive information, as well as AWS’s proprietary information, trade secrets, and confidential financial information, the public release of which would cause either party severe competitive harm,” said Amazon in a court document seeking a protective order. “The record in this bid protest likely will contain similarly sensitive information.”

Last week, U.S. Defense Secretary Mark Esper had rejected any notion of bias in the Pentagon’s decision to award the contract to Microsoft.

Previously, Amazon had said that politics had got in the way of a fair contracting process.

U.S. President Donald Trump has long criticized Amazon and its founder Jeff Bezos.