Nikki Haley wins the Republican presidential primary in Vermont

Mrs Haley is the last major rival to Mr Trump in a once-crowded primary field

Republican presidential candidate former UN Ambassador Nikki Haley (David J Phillip/AP)

Former UN ambassador Nikki Haley scored a surprise victory on Super Tuesday, upsetting Donald Trump to win Vermont.

However, that victory will do little to dent Mr Trump’s primary dominance. The former president won 11 other states on Super Tuesday.