Iran sanctions: Trump warns trade partners

Banking on the power of its dollar, US president warns trading partners against doing business with Tehran, as Washington re-imposes ‘most biting sanctions ever’ on the country.

Despite the threats from the United States, the European Union is encouraging member countries to do business with Iran.

But the White House is counting on the power of its dollar to keep companies in line.

Al Jazeera’s Patty Culhane explains from Washington, DC.