Former President Donald Trump imitates the shooting of a gun with his finger while talking about gun violence in Chicago as he speaks at Trump National Golf Club in Bedminster, N.J., Wednesday, July 7, 2021.

WASHINGTON — Former President Donald Trump has filed suit against three of the country's biggest tech companies, claiming he and other conservatives have been wrongfully censored. But legal experts say the suits are likely doomed to fail, given existing precedent and legal protections.

Trump announced the action against Facebook, Twitter and Google's YouTube, along with the companies' Mark Zuckerberg, Jack Dorsey and Sundar Pichai, at a press conference Wednesday in New Jersey, where he demanded that his accounts be reinstated.

Trump has been suspended from the platforms since January, when his followers violently stormed the Capitol building, trying to block Congress from certifying Joe Biden's presidential win. The companies cited concerns that Trump would incite further violence and have kept him locked out. All three declined comment Wednesday.

Twitter, Facebook and Google are all private companies, and users must agree to their terms of service to use their products. Under Section 230 of the 1996 Communications Decency Act, social media platforms are allowed to moderate their services by removing posts that, for instance, are obscene or violate the services' own standards, so long as they are acting in “good faith.” The law also generally exempts internet companies from liability for the material that users post.

But Trump and some other politicians have long argued that Twitter, Facebook and other social media platforms have abused that protection and should lose their immunity — or at least have it curtailed.

While conservatives often claim the sites are biased against them, several recent studies have found that isn't the case. Indeed, posts by conservative commentators like Ben Shapiro, Franklin Graham, Dan Bongino and Dinesh D'Souza are routinely among the most widely shared on Facebook.