How does a Republican leader say no to Donald Trump? How do they criticize the US president’s policies without facing a social media riot, or losing their career ?

As the party scrambles to redraw key congressional districts after the supreme court effectively gutted a major section of the Voting Rights Act that prevented racial discrimination, all eyes turned this week to South Carolina.

But in a 45-minute address to the state’s senate, Republican majority leader Shane Massey rejected Trump’s demands to redraw its congressional map .

Laying out his case, Massey made clear on Tuesday that he was addressing three audiences: his colleagues in chamber, Republican voters in his state, and the president himself.…