Trump Impeachment Trial Tests Vulnerable Senate Incumbents

(Bloomberg) -- The Senate’s historic impeachment trial of President Donald Trump will be especially momentous for a small group of vulnerable incumbent senators whose 2020 re-election bids are central to determining control of the chamber.Trump is all but certain to be acquitted on two articles of impeachment since the Constitution requires 67 votes to convict. But for just over half a dozen senators locked in the closest races, and a few others whose contests could tip competitive, their