Republicans are opening an impeachment inquiry into U.S. President Joe Biden. Here’s what to know

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Open this photo in gallery: U.S. President Joe Biden speaks at Joint Base Elmendorf-Richardson to mark the anniversary of the Sept. 11 terrorist attacks, on Sept. 11, in Anchorage, Alaska.Evan Vucci/The Associated Press In July, 2019, then-U.S. President Donald Trump asked his Ukrainian counterpart, Volodymyr Zelensky, for a “favour.” Mr. Trump wanted Mr. Zelensky to announce an investigation into whether Joe Biden had used his influence as vice-president to help the Ukrainian business interests of his son, Hunter. The White House withheld almost US$400-million in military aid to Kyiv to put pressure on Mr. Zelensky to comply. That telephone call...