A woman walks past a mural on the wall of the former U.S. embassy in Tehran, Iran, on May 8, 2018.Atta Kenare / AFP – Getty ImagesBreaking News EmailsGet breaking news alerts and special reports. The news and stories that matter, delivered weekday mornings.WASHINGTON — The United States has rejected an appeal from Britain, France and Germany to grant broad exemptions to European firms doing business in Iran, saying it would press ahead with sanctions intended to exert “unprecedented” economic pressure on the Tehran regime, U.S. and Western officials told World News.Replying to a June 4 letter from the European powers, Secretary of State Mike Pompeo and Treasury Secretary Steven Mnuchin wrote that the Trump administration would not agree to wide-ranging protections for European companies operating in Iran and instead would grant only limited exceptions based on national security or humanitarian grounds, the officials said.The stern message comes as the White House has ratcheted up its rhetoric toward Iran, accused Tehran of plotting terrorist attacks in Europe and vowed to hammer the country’s economy.The letter from the Trump administration marks the latest dispute in an increasingly tense U.S. relationship with European allies, aggravated by the president’s harsh criticism of NATO partners this week during his visit to Brussels.Having pulled out of the Iran nuclear deal on May 8, the Trump administration plans to reimpose an array of economic sanctions on Iran, including measures designed to cut off Tehran’s financial sector from Western banks. A first wave of sanctions will enter into force by an August deadline, and then another wave will hit in November.The Iran nuclear deal, which had imposed restrictions on Iran’s nuclear program in return for easing economic sanctions, had “failed to guarantee the safety of the American people,” the letter said, according to U.S. and Western officials.President Donald Trump announces his decision on the Iran nuclear deal in the Diplomatic Reception Room at the White House in Washington on May 8, 2018.Saul Loeb / AFP – Getty ImagesThe administration planned to maintain sanctions on Iran until the United States sees a “tangible, demonstrable and sustained shift in the policies we have enumerated,” it said.“We will seek to provide unprecedented financial pressure on the Iranian regime.”As a result, the administration wrote, the United States is “not in a position to make exceptions to this policy except in very specific circumstances where it clearly benefits our national security.” The letter also noted exceptions for humanitarian purposes.The State Department declined to comment.The three European powers, which also signed the nuclear deal along with Russia and China, sharply disagree with the U.S. withdrawal and are working to keep the accord from unravelling.RelatedLast month, the foreign and finance ministers of Britain, France and Germany wrote to their counterparts in Washington saying their governments believed the Iran nuclear deal was worth preserving as it offered the best chance of preventing a nuclear-armed Iran. And they asked the United States not to take action to prevent them from providing sanctions relief to the Iranians as promised under the accord.In their letter, the ministers said they expected the United States — as a close ally — not to enforce sanctions against EU companies doing business in Iran. And the ministers asked the United States to refrain from punishing firms in certain commercial sectors, including energy, auto manufacturing, aviation, infrastructure and pharmaceuticals.Without some protections from Washington, most major European companies will have little choice but to pull out of Iran, as they can’t afford to lose access to the much larger U.S. market or to jeopardize their ability to finance deals in U.S. dollars.Given the Trump administration’s confrontational rhetoric on Iran, European diplomats said they are not surprised by the administration’s reluctance to carve out major exceptions for European companies. Tough talk from President Donald Trump and his deputies has made clear the United States is intent on waging economic warfare on Iran, European officials and experts said.The CMA CGM Antoine de Saint Exupery, the biggest container ship flying the French flag, in Singapore on February 19, 2018. The world’s third-largest shipping container group, the French-owned CMA CGM, has decided to withdraw from Iran over the threat of US sanctions. “Because of the Trump administration, we have decided to end our service to Iran,” its chief executive said on July 7, 2018.Roslan Rahman / AFP – Getty Images fileIn a briefing earlier this week with reporters traveling with the secretary of state, a senior State Department official said: “We are very serious and determined about re-imposing our sanctions that were lifted under the Iran nuclear deal.”As part of the economic pressure campaign, senior U.S. officials from the State and Treasury departments are pressing allies and partners around the world to reduce their purchase of Iranian oil while also appealing to Saudi Arabia to increase its oil production to prevent any major disruption of energy markets.A U.S. delegation held three days of talks in Saudi Arabia this month “to discuss energy, diplomacy, security, and economic pressure” on Iran, the State Department official told reporters.The official’sunderscored the rising U.S. tension with Iran. According to a report in Axios, Israel and the United States formed a joint working group in recent months to help support internal opposition to the Tehran regime. And at a press conference in Brussels on Thursday, Trump said that that “there might be an escalation between us and the Iranians.”Pompeo has unveiled plans for a major address on July 22 entitled “Supporting Iranian Voices” after having issued a series of tweets endorsing Iranian protests and pointing to high unemployment among the country’s youth. “People are tired of the corruption, injustice & incompetence of their leaders. The world hears their voice,” Pompeo wrote on June 27.Some critics of the administration, including Sen. Tim Kaine, D-Va., say the withdrawal from the Iran deal combined with the administration’s sharp public statements raise the risk of a potential war with Iran.“I fear the United States is on the verge of blundering into another unnecessary war with Iraq’s next-door neighbor Iran,” Kaine wrote in The Atlantic.