President Donald Trump is challenging a federal appeals court decision that ruled he violated the US Constitution by blocking people whose views he disliked from his Twitter account.

In court papers filed late on Friday by the US Justice Department, Trump sought a rehearing by the full 2nd US Circuit Court of Appeals in New York, calling the 3-0 decision "fundamentally misconceived".

Trump has more than 63 million followers, and often uses his account to make significant announcements, including on Friday when his tweets about trade with China sent US stock and oil prices down sharply.

The three-judge panel last month upheld a May 2018 lower court ruling that forced Trump to unblock several dozen followers.

Twitter Inc and the White House declined to comment.

In the appellate court ruling, Circuit Judge Barrington Parker wrote, "the First Amendment does not permit a public official who utilises a social media account for all manner of official purposes to exclude persons from an otherwise-open online dialogue because they expressed views with which the official disagrees."

White House social media director Dan Scavino, who was also a defendant, is also challenging the appeals court ruling.

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The Justice Department court filing on Friday warned that if the appeals court ruling was upheld, "public officials who address matters relating to their public office on personal accounts will run the risk that every action taken on that account will be state action subject to constitutional scrutiny".

Parker, however, had said Trump's account bears "all the trappings of an official, state-run account" and is "one of the White House's main vehicles for conducting official business".

Trump has made his @RealDonaldTrump account, which he opened in 2009, a central and controversial part of his presidency, using it to promote his agenda and attack critics.

His blocking of critics was challenged by the Knight First Amendment Institute at Columbia University, as well as seven Twitter users he had blocked.

The Justice Department filing noted that, since the ruling, two lawsuits were filed accusing Representative Alexandria Ocasio-Cortez of violating the First Amendment for blocking individuals on her personal Twitter account.

The Justice Department filing said the court's "mistaken First Amendment reasoning is being applied not just to any public official, but to the President of United States".

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