A key ally of Donald Trump has revised his testimony in the impeachment inquiry and now says the US president offered a quid pro quo with Ukraine to investigate a political rival.

US ambassador to the European Union Gordon Sondland now acknowledges that American military aid to Ukraine was contingent on Kyiv investigating Joe Biden and his son for corruption.

This further strengthens the case against Trump.

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

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