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Donald Trump refuses to rule out independent run if he loses GOP nomination

  • Donald Trump renews threat to run as an independent
  • Scott Walker says Ted Cruz would be a stronger general-election candidate than Donald Trump
  • Other Republicans in Wisconsin are flocking to Cruz
  • Trump is the least popular American politician in three decades
  • Hillary Clinton, campaigning in New York, sharpens attack on Bernie Sanders’ record on gun control
  • John Kasich to join Ted Cruz at California GOP convention