John Bolton has been called in to testify in the impeachment inquiry into US President Donald Trump.
The former National Security Adviser has been summoned by the House of Representatives investigators.
The US President is being investigated for pressuring Ukraine to investigate former US Vice-President Joe Biden and his son.
Trump denies the claims.
Bolton, who has spoken against the president on the matter, has been asked to testify on November 7.
Top US executive fatally shot in Manhattan
Brian Thompson, the CEO of UnitedHealth's insurance unit, was fatally shot on Wednesday morning outside a midtown Manhattan hotel, several media outlets reported, just before a scheduled company investor conference.
Gunman shoots at Sikh leader outside India's Golden Temple
A gunman shot at a prominent Sikh politician outside the Golden Temple in northern India on Wednesday before police caught and arrested him.
Israeli forces advance in Khan Younis, 20 killed across Gaza
Israeli tanks pushed into northern parts of the Khan Younis area in the south of the Gaza Strip on Wednesday and Palestinian medics said Israeli airstrikes had killed at least 20 people across the enclave.
South Korean lawmakers call to impeach President Yoon
South Korean lawmakers on Wednesday called for the impeachment of President Yoon Suk Yeol after he declared martial law only to reverse the move hours later, triggering the biggest political crisis in decades in Asia's fourth-largest economy.
Syria rebels 'at gates' of central city Hama
Syrian rebel forces arrived at the gates of the key city of Hama on Tuesday, as their fighting with the military sparked "a large wave of displacement", a war monitor said.
