For Republican presidential frontrunner Donald Trump, being the United States' greatest president will not be enough. He actually wants to become America's first "Superman" president.

In an interview with television host John Harwood on CNBC's "Speakeasy," Trump pledged to bring solutions to America's policy problems just like a superhero.

"Your answer to policy questions is, 'I'm Trump, I'm good, I'm the best, I will get it done,'" Harwood commented during the interview.

To this, the controversial business tycoon replied, "Well, there's a little truth to that. In fact, a lot of truth to that."

The television host continued by saying, "But we don't have Superman presidents."

"We will if you have Trump. You watch," Trump retorted.

In the interview, shot inside Trump's famous skyscraper in New York, the business mogul further admitted that he would quit the White House race if he begins to lose his frontrunner status, saying he is "not a masochist."

"If that changed, if I was like some of the people at 1 percent and 2 percent, there's no reason to continue forward. Now, if I tank, you know, sure, go back to business. Why wouldn't I?" he said.

Trump also once again criticised America's leaders for being "incompetent" and "in some cases, stupid" in foreign policy, particularly towards Mexico, China, and Japan.

Trump to send refugees back to Syria

In a separate speech in Keene as reported by BBC News, Trump also said he plans to send Syrian refugees out of America if he wins as president.

"If I win, they're going back," Trump told his supporters.

The Republican presidential aspirant said he will do this because Syrian migrants "could be ISIS."

"I am putting the people on notice that are coming here from Syria as part of this mass migration, that if I win, they're going back," Trump said.

The businessman earlier acknowledged that the migrant crisis is a "serious problem" that requires immediate humanitarian solutions.