This time, House Speaker Nancy Pelosi was certain: She publicly accused US President Donald Trump of having violated the constitution. During the past few months Pelosi had warned that reliable evidence was needed to launch impeachment proceedings. But what follows now is effectively Robert Mueller 2.0 — both sides, the Democrats and Republicans, will fight tooth and nail over the “correct” interpretation of the phone call between Trump and Ukrainian President Volodymyr Zelenskiy.

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