Vice President Mike Pence's aide Jennifer Williams was subpoenaed to give her testimony, while former national security adviser John Bolton's attorney said he had no interest in testifying without being subpoenaed.
As the impeachment inquiry gains momentum, US President Trump accuses Democrats of trying to "fix" proceedings.
Meanwhile, US President Donald Trump's former national security advisor John Bolton has been asked to testify in the impeachment probe examining potential abuse of power by the president, US media reported.
President Hassan Rouhani says Tehran will continue to reduce its nuclear commitments until European parties to the pact save it by protecting Iran's economy from US penalties.
Turkey’s presidential spokesman Ibrahim Kalin and the US National Security Advisor Robert O'Brien also discuss other issues including bilateral trade target of $100 billion annually, counter-terrorism.
The president’s delicate relationship with the Saudi royal family and Trump's re-election campaign are the real targets of the attack on Saudi Aramco.
He has helped presidential candidates, worked with secretaries of state, run a law firm, written a book of essays. Meet Robert O’Brien, the fourth national security advisor in the Trump administration.
US President Trump appoints Robert O'Brien, his chief hostage negotiator and an established figure in Republican policy circles, for new role after firing his hawkish aide John Bolton.
Donald Trump cannot drag the US into another war ahead of an election and Iran is suffering from a crumbling economy and an increasingly frustrated populace.
Donald Trump has one less hawk in his administration, that much is certain. What is unclear is whether it means a less combative foreign policy with countries like Iran or Venezuela.
US President Donald Trump says he is considering five people to replace ousted national security advisor John Bolton, who, he says, was not aligned with his administration's priorities.
Donald Trump wanted to draw down American involvement around the world. John Bolton wanted America everywhere. That relationship is now over.
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