The White House is pushing back against the publication of a book by former national security adviser John Bolton, citing security concerns.
The National Security Council said the book had “top secret” details that must be removed, a claim Mr Bolton rejects.
A manuscript of the book reportedly claims that President Donald Trump linked freezing military aid to Ukraine in exchange for a political favour.
The book row comes as the questioning period of the impeachment trial begins.
On Friday, senators will hold a key vote on whether or not to allow witnesses in the trial. Democrats are demanding Mr Bolton testify in the wake of these claims, and some Republicans have also suggested they would like to hear from the former adviser.
The president has denied all the allegations against him.
Article URL : https://www.bbc.com/news/world-us-canada-51304366