New twists put Republicans on spot in impeachment saga

(CNN)Washington’s impeachment battle over President Donald Trump’s conduct with Ukraine is intensifying with news of a second whistleblower while new testimony this week brings the prospect of more stunning revelations to deepen the crisis. The weekend’s political exchanges suggested that despite a week of barely believable drama, Trump’s feverish efforts are having some success in stopping any serious slippage in support among Republican lawmakers, especially ahead of any eventual Senate impeachment trial. But recent developments also sharpen the core questions at stake in the impeachment saga that are critical to the office of the presidency going forward and US democracy itself. Given the evidence that is already public, the question is becoming — is it permissible for a President to …