The social media app, a magnet for the far right, sued to get back online, arguing that Amazon had breached its contract and abused its market power.
It said Trump was likely on the brink of joining the platform, following a wave of his followers who flocked to the app after Twitter and Facebook expelled Trump after the January 6 assault on the US Capitol.
Parler CEO John Matze asserted in a court filing that Parler's abrupt shutdown was motivated at least partly by "a desire to deny President Trump a platform on any large social-media service."
Matze said Trump had contemplated joining the network as early as October under a pseudonym. The Trump administration last week declined to comment on whether he had planned to join.
Amazon denied its move to pull the plug on Parler had anything to do with political animus. It claimed that Parler had breached its business agreement "by hosting content advocating violence and failing to timely take that content down."
Parler was formed in May 2018, according to Nevada business records, with what co-founder Rebekah Mercer, a prominent Trump backer and conservative donor, later described as the goal of creating "a neutral platform for free speech" away from "the tyranny and hubris of our tech overlords."
Amazon said the company signed up for its cloud computing services about a month later, thereby agreeing to its rules against dangerous content.
Matze told the court that Parler has "no tolerance for inciting violence or lawbreaking" and has relied on volunteer "jurors" to flag problem posts and vote on whether they should be removed. More recently, he said the company informed Amazon it would soon begin using artificial intelligence to automatically pre-screen posts for inappropriate content, as bigger social media companies do.
Amazon last week revealed a trove of incendiary and violent posts that it had reported to Parler over the past several weeks. They included explicit calls to harm high-profile political and business leaders and broader groups of people, such as schoolteachers and Black Lives Matter activists.
Google and Apple were the first tech giants to take action against Parler in the days after the deadly Capitol. Both companies temporarily banned the smartphone app from their app stores. But people who had already downloaded the Parler app were still able to use it until Amazon Web Services pulled the plug on the website.
Parler has stayed online by maintaining its internet registration through Epik, a US company owned by libertarian businessman Rob Monster.
Epik has previously hosted 8chan, an online message board known for trafficking in hate speech.
Parler also gets support against denial-of-service and other attacks from DDoS-Guard, a company whose owners are listed as residing in Russia, public records show.
The case has offered a rare window into Amazon's influence over the workings of the internet.
Parler also argued in its lawsuit that Amazon violated antitrust laws by colluding with Twitter to quash the upstart social media app, although it offered little evidence for that claim other than the fact that Twitter, like Parler, is an Amazon Web Services customer.
Amazon said Twitter doesn't use its cloud services to power its main feed, though it will in the future.
Rothstein has been on the Seattle-based court since her 1980 appointment by Democratic President Jimmy Carter.
