The Trump administration is making a last-ditch effort to stop the publication of a damaging new book by a former national security adviser.
Among several allegations, John Bolton says Donald Trump "pleaded" for help from China to win re-election in 2020.
The Justice Department has filed an emergency order seeking to block the release on national security grounds.
Constitutional experts say the move is unlikely to succeed and US media have already published extracts.
The new work - The Room Where It Happened - is due to go on sale on 23 June. In it, John Bolton paints a picture of a president whose decision-making was dominated by a desire to win the presidency again.
Many of the allegations are based on private conversations and are impossible to verify. The Trump administration has pushed back against Mr Bolton, with the president saying the book was "made up of lies and fake stories".
"Many of the ridiculous statements he attributes to me were never made, pure fiction," Mr Trump tweeted on Thursday, adding: "Just trying to get even for firing him like the sick puppy he is!"
Despite this, Mr Bolton's book has been keenly anticipated, given his formerly high-ranking status as the president's top adviser on security matters.
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