Washington — The Democratic Party-led US House of Representatives was set on Wednesday to push forward with its impeachment investigation of President Donald Trump over his dealings with Ukraine, a day after the White House declared its refusal to co-operate with the probe.

The three congressional committees leading the inquiry were working on final arrangements to interview a US intelligence officer who filed the whistle-blower complaint that triggered the probe, a day after the state department abruptly blocked the US ambassador to the EU from speaking to them...

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