What would a President Trump mean for the world?

01:34 - Source: CNN
World leaders on 'President Trump'

Story highlights

A look at Trump's policies to see what kind of U.S. president he'd really be

From Mexico "Wall," to ISIS, and Israel, there is perhaps no more polarizing figure in politics

CNN —  

It’s hardly a certainty, but it’s now a real and startling possibility – what should the world expect if Donald Trump is elected U.S. president?

READ: Is the race for the Republican nomination already over?

America’s most unpredictable candidate could turn into America’s most unpredictable commander-in-chief.

“We’re not going to be the dummies anymore,” he told supporters in late February. “We’re going to be the smart ones.”

Trump has been many things – a billionaire real-estate developer, a brash reality-TV star and a best-selling author. But he’s never held elected office or delved deeply into foreign policy.

“I don’t think he’s drawing on a deep reservoir of knowledge on these issues,” said former American diplomat Christopher Hill.

“He comes across as someone with a lot of instincts and not a lot of reserve about acting on those instincts.”

READ: America’s crazy voting system explained

Trump vows to champion U.S. economic strength and military power – “to make America great again,” as he says.

He’s giving voice to many voters’ frustrations and fears about America’s place in the world.

What he would do about them is sometimes less clear.

The Wall

The centerpiece of Trump’s presidential campaign is the plan to build a wall along the U.S. border with Mexico as a barrier against illegal migration, criminals and narcotics trafficking.

Trump insists Mexico will pay for it. A spokesman for Mexico’s president says his government will not.

Whatever the ultimate source of the financing, it would almost certainly involve billions of dollars passing through the coffers of the U.S. government, which only Congress has the authority to approve.

And there has been no rush by Washington lawmakers to embrace the plan.

00:47 - Source: CNN
Mexico's ex-president drops F-bomb on Trump's wall


Trump vows to “bomb the hell” out of ISIS in Iraq – especially the oil wells it’s captured there – to deprive it of income.

In Syria, Trump says he would leave the job of fighting ISIS to the government and – alone among major presidential candidates – he has welcomed Russia’s military support for the regime.

Under Trump, the U.S. would also refuse to accept Syrian refugees (and, at least temporarily, all Muslims from anywhere in the world).

Instead, he proposes a safe zone for civilians inside Syria that Washington would help fund but other nations would build and defend.

02:21 - Source: CNN
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War on Terror

Trump would resume the widely condemned interrogation technique known as waterboarding, adding that “it’s not really tough enough.”

He’s told voters that “torture works” – and he would also maintain the U.S. prison at Guantanamo Bay, Cuba, and add more prisoners.