WASHINGTON - President Trump did not know that Britain was a nuclear power, according to his former national security adviser.

In his new book, John Bolton, who served for 17 months in the White House, says that during a meeting, the “stunningly uninformed” US president asked a British official: “Oh, are you a nuclear power?” The book also claims that Trump tried to get China's Xi Jinping to help him secure re-election.

Mary Trump, Donald Trump’s niece, is to release an unflattering tell-all memoir about the US president next month, her publisher has announced.

Titled Too Much And Never Enough: How My Family Created the World’s Most Dangerous Man, the book is packed with what inside sources describe as “harrowing and salacious” stories about the US leader, The Daily Beast reports.