Microsoft made headlines several weeks ago when it beat out Amazon for a lucrative Pentagon contract worth some $10 billion. Now, according to ABC News, Amazon is protesting the decision, saying there was “unmistakable bias” in the selection process.

Oracle and IBM were both eliminated during an earlier phase of the process, leaving only Microsoft and Amazon. Amazon was widely considered to be the front-runner to receive the Pentagon contract, in large part because of how far ahead it is in the overall cloud market. After President Trump, as well as its rivals, criticized Amazon, Microsoft won the bid.

In response, Amazon has filed a protest with the U.S. Court of Federal Claims, citing what it described as “clear deficiencies, errors, and unmistakable bias.” By filing with the Court of Federal Claims, Amazon will have access to government documents in an effort to make its case.

Whether Amazon will be able to change the outcome of the decision remains to be seen, although experts are not optimistic. While Amazon has nothing to lose by challenging the results, and President Trumps comments have been labeled “inappropriate and improvident,” experts believe it will be difficult to make a case that the White House applied enough pressure to sway the final outcome.