Donald Trump cruised to a decisive victory Saturday in the South Carolina Republican primary, blitzing rival Nikki Haley in her home state and continuing his march to the nomination and a White House rematch with Joe Biden.

Trump completed a sweep of the first four major nominating contests, converting a year of blockbuster polls into a likely insurmountable lead going into the “Super Tuesday” 15-state voting bonanza in 10 days.

While Haley repeatedly questioned the 77-year-old former president’s mental fitness and warned another Trump presidency would bring “chaos,” her efforts appeared to do little to damage his standing among Republicans.

The margin of victory was not immediately clear but it was expected to be significant, with major US networks calling the race within seconds of the polls closing. 

Haley, a popular governor of South Carolina in the 2010s and the only woman to have entered the Republican contest, was looking to outperform expectations in her own backyard and ride into Super Tuesday with wind her sails.

But she was never able to compete in a battleground that preferred Trump’s brand of right-wing “America first” populism and personal grievance over the four indictments and multiple civil lawsuits he faces.