The statement comes a day after Acting Chief of Staff Mick Mulvaney said there was no quid pro quo during US President Trump's phone call with the Ukraine president that sparked the House investigation.
House Intelligence Committee Chairman Adam Schiff citing witnesses says that US President Donald Trump's phone call with Ukranian President Volodymyr Zelenskiy was planned in advance and then followed up.
During a campaign stop, Democratic presidential contender Joe Biden unexpectedly took the gloves off and explicitly called for impeachment.
Gordon Sondland had been due to meet behind closed doors with staff of three Democratic-led House committees over the role he may have played in President Trump's efforts to get Ukraine to probe former vice president Joe Biden, a political rival.
US President Donald Trump has called on China to look into former vice president Joe Biden's business dealings and those of his son as House panels questioned former US special envoy to Ukraine in the unfolding impeachment inquiry against Trump.
US President Donald Trump boiled over at the impeachment inquiry Democrats are pursuing over his July 25 phone call to Ukraine President Volodymyr Zelenskiy.
Democrats ask White House for documents related to President Trump's call with Ukraine leader and subpoena Secretary of State Mike Pompeo, who admits listening in on the July call that's triggered impeachment inquiry of Trump.
US Secretary of State Mike Pompeo accuses Democrats of bullying and intimidation in asking five diplomats to testify on White House efforts to seek dirt on President Trump's political rival.
Russian caveat comes after US House Intelligence Committee vowed to get access to President Trump's calls with Russian President Putin and other world leaders, citing concerns Trump may have jeopardised national security.
Democrats charged aggressively into an impeachment investigation of President Donald Trump, ordering Secretary of State to turn over Ukraine-related documents and scheduling testimony for witnesses to alleged abuse of power by the US leader.
Leading Democrats have called for accountability as the fallout of Trump's Ukraine scandal shows no sign of receding.
In the days following the phone call between President Trump and Ukraine's new president, senior White House officials intervened to "lock down" all records of the call, according to a declassified whistleblower complaint.
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