Senator Ted Cruz is a hardliner, even by the standards of his native Texas: anti-abortion, anti-gay marriage, in favour of the death penalty and fiercely opposed to gun control. But in the race to be the next US president, some believe he has the best chance of beating Donald Trump to the Republican nomination. Son of a Cuban immigrant - and a virtual unknown three years ago - the 'anyone-but-Trump' candidate's ascent through Republican ranks has been as stratospheric as his style is divisive. With the 2016 American election looming, we profile a man who, as a teenager, used to tour the Deep South reciting the US Constitution by heart. Making his name as a hot shot young lawyer, Senator Cruz helped George W. Bush reach the White House by winning a court battle over the infamous Florida election recount. And as a rookie politician, he made headlines with a marathon 21-hour filibuster featuring children's stories by Dr Seuss.

We hear from early backers and political opponents, those who shared Ted Cruz's school days and witnessed his early legal triumphs. With make-or-break Republican primaries coming thick and fast - and Super Tuesday having transformed the competition - how has a politician with almost as many enemies on his own side as among the Democrats come within sight of the White House? What impact has his Christian faith had on his politics? And can Senator Cruz become - as he dreamed as a teenager - the most powerful man in the world?