Washington — If an investigation shows that US President Donald Trump pressured Ukraine to investigate former vice-president Joe Biden, the US Congress may have no choice but to pursue impeachment, house intelligence committee chair Adam Schiff said on Sunday.

On Sunday, Trump and his allies, including secretary of state Mike Pompeo, defended the president’s phone call — reportedly the subject of a complaint made by an as-yet-unnamed whistle-blower — and escalated their attacks on Biden...

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