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After three years and countless calls for her to do so, it wasn't Robert Mueller or the Russia investigation that forced House Speaker Nancy Pelosi to kick off an impeachment investigation into President Trump, as many had expected.

It took an alleged conversation between Trump and the Ukrainian president about former Vice President Joe Biden's son, the possible withholding of military aid, and an intelligence whistleblower to finally encourage Pelosi that the Democratic Party had no other choice.

The president, in New York at the United Nations, issued a defiant response on Twitter: “PRESIDENTIAL HARASSMENT!” 

So, what now?