The United States reiterated on Monday it intention to force the Iranian regime to alter its behavior by cutting its oil exports to zero, said the State Department. Brian Hook, the senior official leading negotiations with US allies on a new Iran strategy, said Washington is confident the world has enough spare oil capacity to replace Iranian crude. "Our goal is to increase pressure on the Iranian regime by reducing to zero its revenue from crude oil sales," Hook, the State Departments director of policy and planning, told reporters. "Now, we are working to minimize disruptions to the global market, but we are confident that there is sufficient global spare oil production capacity. He confirmed that US secondary sanctions on firms dealing with Iran would "snap back" on August 6 for trade in cars and metals. "Banking sanctions will also snap back on November 4, and we will be aggressively enforcing these provisions to lock up Irans assets overseas and deny the Iranian regime access to its hard currency." This has been US policy since President Donald Trump pulled out of the 2015 Iran nuclear accord on May 8, but many foreign capitals have been demanding waivers to allow some trade to continue. Although the European signatories to the Iran deal -- Britain, France and Germany -- lobbied hard for Trump to stay in the accord, their companies are likely to acquiesce to the renewed sanctions. In comments aired Sunday by Fox News, Trump said that European allies will face sanctions if they continue to trade with Iran. Western diplomats say few major firms would see enough profit in dealing with Iran to justify the risk of losing access to US trade and finance. Hook said so far more than 50 international firms have announced their intent to leave the Iranian market. He did not specify which firms. He said teams of US diplomats are deploying to explain and defend Washington’s policy, but warned: "We are not looking to grant licenses or waivers, because doing so would substantially reduce pressure on Iran. "We are prepared to work with countries that are reducing their imports on a case-by-case basis," he added. "But as with our other sanctions, we are not looking to grant waivers or licenses." "We have been clear with countries and companies around the world that we are bringing severe economic pressure on Iran until the regime changes its destabilizing policies," Hook stated.