US Whistleblower complaint about President Trump 'credible'

The US House Intelligence Committee says the whistle-blower complaint released on Thursday revealed a series of "damning allegations" concerning President Donald Trump's conduct, including a telephone call in which he sought information about a political opponent from Ukraine's president.

Activists rally for the impeachment of President Donald Trump, at the Capitol in Washington. Source: AAP

US President Donald Trump has described the grounds for his impeachment laid out by Democrats as a joke, after he was accused of pressuring his Ukrainian counterpart for domestic political reasons.

House Speaker Nancy Pelosi announced the launch of impeachment proceedings against the President after a whistle-blower reported a conversation between Mr Trump and the Ukraine President to the U-S intelligence inspector general in August.

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