He's been derided by the international media - and ridiculed by his own party.
Now, Donald Trump is set to become the Republican party's presidential nominee, 10 months after launching his unlikely bid for the White House.
His critics say he's the least prepared candidate for president in modern American history; a man whose isolationist and xenophobic rhetoric is alarming to many at home and abroad.
Yet his message resonates with many Americans.
And US allies and enemies alike are starting to consider how a Trump presidency would affect US relations with the rest of the world.
On this Inside Story, we examine Trump's foreign policy.
And we ask, how would the world react to Trump taking the White House?
Presenter: Hazem Sika
Ryan Grim - Washington Bureau Chief at the Huffington Post.
Shibley Telhami - Anwar Sadat Professor for Peace and Development at the University of Maryland.
James Boys - Associate Professor of International Political Studies at Richmond University.
Source: Al Jazeera