Trump's fiercest GOP critic became his most influential voice on war and peace

In 2015, Sen. Lindsey Graham called Donald Trump a "jackass" and warned Republicans that nominating him would be a disaster. Trump responded by reading Graham's personal cellphone number aloud during a campaign rally, encouraging supporters to call the South Carolina senator. Few political rivalries seemed less likely to evolve into one of Washington's most consequential foreign policy partnerships . Trump rose to power promising to end America's "endless wars" and challenging decades of Republi