The national security adviser explained that the sanctions are meant to motivate the Iranian regime to "commit to give up their nuclear weapons program, their ballistic missiles, their support for terrorism".
The Trump administration on Tuesday reimposed sanctions on Iran that were lifted as part of a nuclear agreement with the country - a follow-through on the order President TrumpDonald John TrumpFive takeaways from Ohio's too-close-to-call special election Mar-a-Lago insiders provided input on VA policy, personnel decisions: report Trump claims victory as Balderson holds on to slim lead in Ohio MORE gave when he withdrew from the nuclear pact in May.
"These are the most biting sanctions ever imposed, and in November they ratchet up to yet another level".
In a tweet, Mr Trump warned: "Anyone doing business with Iran will NOT be doing business with the United States".
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The high-level meeting follows the reimposition of sanctions on Iran by the USA on Tuesday, which a White House statement said targeted the country's energy sector and foreign financial institutions doing business with the Central Bank of Iran.
"The US withdrawal from JCPOA and re-imposition of its sanctions is a serious breach of its legal obligations under the United Nations Charter, which entails its global responsibility".
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European countries have also vowed to protect the nuclear deal by continuing to trade with Iran. He added that the sanctions are just one component of the Trump administration's strategy to combat the Iranian regime.
Turkey, however, said it would continue to buy natural gas from Iran.
North Korea's foreign minister Ri Yong Ho on Wednesday met with the Iranian President in Tehran on the second day of an ongoing trip to the country, Iranian state news outlets reported, with Rouhani stressing the DPRK should not place excessive trust in American commitments.
USA officials have said in recent weeks that they aim to reduce Iran's oil exports to zero as a means of pressuring Tehran to halt its nuclear and missile programmes and involvement in regional conflicts in Syria and Iraq.
Rouhani hinted last month that Iran could block the Strait of Hormuz, a major oil shipping route, if the US attempted to stop the Islamic Republic's oil exports.
The administration will ratchet up pressure on Tehran's economy in early November when US sanctions on Iranian oil are due to snapback.
"The Americans have assembled a war room against Iran".