Amazon is alleging that US President Donald Trump abused the power of his office to deny the company a massive military cloud computing contract, court documents released Monday showed.

The technology giant is challenging the awarding of a $10 billion Pentagon cloud computing contract to Microsoft, alleging "unmistakable bias" in the process.

The 10-year contract for the Joint Enterprise Defense Infrastructure program, better known as JEDI, ultimately will see all military branches sharing information in a system boosted by artificial intelligence.

A heavily redacted filing detailed alleged errors that ended with Microsoft being chosen over its Amazon Web Services (AWS) cloud computing division, part of the technology group led by Amazon chief Jeff Bezos, a frequent target of the US president.

"They were the result of improper pressure from President Donald J. Trump, who launched repeated public and behind-the-scenes attacks to steer the JEDI contract away from AWS to harm his perceived political enemy - Jeffrey P. Bezos," the filing maintained.

"DoD's substantial and pervasive errors are hard to understand and impossible to assess separate and apart from the president's repeatedly expressed determination to, in the words of the president himself, 'screw Amazon.'"

The bid protest filed in US Court of Federal Claims urges that the rival JEDI bids be re-evaluated and a new decision reached.