The White House issues formal threat to former national security adviser John Bolton to keep him from publishing his book, citing security concerns amid Donald Trump's impeachment trial.

US President Donald Trump has taken to Twitter as the possibility of John Bolton’s testimony grows stronger.

US President Donald Trump's legal team has wrapped up three days of arguments in his Senate impeachment trial on Tuesday.

President Trump has denied he told former national security adviser John Bolton that releasing security aid for Ukraine was dependent on Kiev investigating his political rivals.

John Bolton reportedly alleges that President Trump wanted to freeze Ukrainian military aid until Kiev investigated his political rivals.

Trump intends to block his former national security adviser from testifying in his impeachment trial.

A court ruling expected on Monday (November 25) could give cover to John Bolton and other administration officials to cooperate in the impeachment inquiry against US President Donald Trump, legal experts said.

US President Donald Trump’s former National Security Adviser John Bolton said on Friday that Twitter had returned control of his personal account to him after it had been taken over by the White House.

John Bolton is widely seen as the architect behind the all-or-nothing deal that led to the collapse of US-North Korea summit in Hanoi this February. With Bolton gone, prospects have changed.

Former US national security adviser John Bolton is reportedly looking to sign a book deal in which he plans to "dish" a lot about the Trump administration, a report says.