“Super Tuesday” is underway – the make or break series of US primaries that will really put to the test the dominance of the presidential frontrunners in the race for the White House.

Virginia kicked off the voting early on Tuesday, the first of more than ten states where people will designate their preferred presidential candidate.

Around a fifth of Republican delegates, and a quarter of Democrats, will have their say in the biggest single day of state-by-state nominating contests for November’s election to succeed Barack Obama.

Donald Trump will be seeking to stay ahead of his Republican rivals Ted Cruz and Marco Rubio.

The tycoon may be looking stronger than ever as he goes into Super Tuesday but his popularity among Republicans continues to be dogged by controversy.

His rally in Virgina was disrupted by protests against his failure to denounce the endorsement of a Ku Klux Klan leader, but once again he turned it to his own advantage vowing to unite the country.

“When