John Bolton, the former National Security Advisor to President Donald Trump, raised concern on Monday about his unpublished book being "suppressed" by the White House and suggested he should be able to respond to the president's tweets about him.

Bolton hopes his book is not 'suppressed' by White House

Three US senators will meet with Ukrainian President Volodymyr Zelenskiy in Kyiv on Friday, seeking to reinforce the importance of his country as a strategic US ally after he found himself at the centre of President Donald Trump's acrimonious impeachment trial.

US Senators plan on visiting Ukraine after Trump impeachment trial

Democrats laid out a formal roadmap for President Donald Trump's impeachment Thursday as they accumulated more evidence to support charges that he improperly pushed Ukraine to boost his own 2020 electoral prospects.

House to formalise Donald Trump impeachment investigation