From criticizing President Donald Trump for congratulating Vladimir Putin on his re-election in March, to saying earlier this month that Trump’s comments about withdrawing from Syria “emboldened” Bashar al-Assad, Arizona Senator John McCain in recent weeks has continued to uphold his reputation as one of the Republican Party’s most vocal critics of the president. But what was perhaps McCain’s most dramatic gesture of dissent against President Trump to date came at 1:30 a.m. on July 28, 2017. In the opening scene from the new FRONTLINE documentary McCain, which traces the Republican Party’s evolution across McCain’s political career, and how President...