Tensions rose after the United States said last month that it would not renew waivers allowing Tehran's eight largest customers to purchase oil from Iran in order to bring Iranian oil exports to zero.
But in a softer approach, Trump told reporters on Thursday at the White House: "What I would like to see with Iran, I would like to see them call me".
President Donald Trump's Iran policy has been rooted in the idea that being harder on Tehran would yield much better results and perhaps even a brand new nuclear deal to substitute the Obama administration pact that he pulled the USA out of a year ago Wednesday.
Iran "has engaged in an escalating series of threatening actions and statements in recent weeks", Pompeo said, echoing Pentagon and unnamed USA officials.
"We are very anxious about a conflict, about the risk of a conflict. of an escalation that is unintended", Britain's Jeremy Hunt told reporters in Brussels before talks with Pompeo.
"The Americans know that no other war will bring about their defeat to such an extent and that's why there won't be a war, because war is not part of the USA strategy", Heshmatollah Falahatpishe, the head of Iran's parliamentary commission for national security and foreign affairs, said in a speech before lawmakers, according to ISNA.
The US aircraft carrier Abraham Lincoln, deployed as a warning to Iran, passed through Egypt's Suez Canal on Thursday and American B-52 bombers have also arrived at a US base in Qatar, US Central Command said.
Iran's decision to no longer abide by some of the agreed limits on its nuclear activities showed it is "not in a position of weakness", a deputy speaker of the Islamic republic's parliament said Sunday.
Tehran dismissed the increased USA military presence in the region as "psychological warfare" and said the United States "will not dare" to take military action.
The US has also taken recent measures that could make it hard for Iran to adhere to the pact, ending non-proliferation related waivers that allowed Iran to export heavy water and low-enriched uranium to stay below levels mandated in the 2015 Joint Comprehensive Plan of Action, as the nuclear deal is formally known.
Asked about Trump's comments, Iran's ambassador to the United Nations, Majid Takht Ravanchi, said Tehran had been talking with the six powers, including the United States, within the framework of the nuclear deal.
Mr Motahhari told FARS news agency: "The US military forces" deployment in the Persian Gulf is more of the nature of psychological warfare.
Last week, Trump urged Iran's leaders to talk to him about giving up their nuclear programme and said he could not rule out a military confrontation.
"We've seen this reporting", Pompeo said.
The Swiss embassy in Tehran represents US interests in the Islamic Republic.
Trump himself says he's ready to talk.
Ahead of an European Union summit in Romania on Thursday, French President Emmanuel Macron said that the nuclear deal must be saved and that the accord's signatories should do all they can to ensure Iran respects it.
Bolton and Secretary of State Mike Pompeo have warned Teheran that it would face "unrelenting force" if Iran attacked USA interests or its allies.
"People have economic problems, but the only problem is not economic, therefore, we must pay attention to all aspects", the president said, referring to a political activist's remarks who described people's problem merely economic.
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