Republican presidential front-runner Donald Trump expects to end up in the White House, but he says if he doesn’t, he’ll “go back to what I was doing.”

“I loved what I was doing,” he said on ABC’s 20/20 in an interview airing Friday night.

“I love doing it, to be honest with you. I've built a great company, but this [the presidency] is just a greater calling,” he added. 

“But I think this is just a greater calling. I mean, this is the ultimate calling.”

Trump says he knows he is not guaranteed a victory in his 2016 campaign.

“Everyone says, ‘Oh you'll never lose,’ ” he told 20/20. “Look, you can always lose.” 

“You're going against people that are senators and governors, they're not stupid people,” he added. “You can lose the nomination, you can lose the election. What's next? I go back to what I doing.”