Trump attempts to discredit whistle-blower in impeachment probe

US president denounces impeachment investigation against him as a 'coup' as more witnesses are called to testify.

    US President Donald Trump has denounced an impeachment investigation against him as a “coup”.

    A war of words between House Democrats and a key member of his cabinet has erupted in Washington, DC, as more witnesses are being called to testify in an impeachment inquiry.

    Al Jazeera's Heidi Zhou-Castro reports from Washington, DC.


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