Washington: US President Donald Trump’s advisers are debating an order intended to designate the Muslim Brotherhood as a foreign terrorist organisation, targeting the oldest and perhaps most influential Islamist group in the Middle East.

A political and social organisation with millions of followers, the Brotherhood officially renounced violence decades ago and won elections in Egypt after the fall of President Hosni Mubarak in 2011. Affiliated groups have joined the political systems in places like Tunisia and Turkey, and President Barack Obama long resisted pressure to declare it a terrorist organisation.

But the Brotherhood calls for a society governed by Sharia, and some of its former members and offshoots — most notably Hamas, the Palestinian group whose stated goal is the destruction of Israel — have been tied to attacks. Some Trump advisers have viewed the Brotherhood for years as a radical faction secretly infiltrating the US to promote Sharia. They see the order as an opportunity to finally take action against it.

Officially designating the Brotherhood as a terrorist organisation would roil US relations in the Middle East. The leaders of some US allies — like Egypt, where the military forced the Brotherhood from power in 2013, and the Gulf states- have pressed Trump to do so to quash internal enemies, but the group remains a pillar of society in parts of the region.

The proposal to declare it a terrorist organisation has been paired with a plan to similarly designate Iran’s Islamic Revolutionary Guards Corps (IRGC), according to current and former officials briefed on the deliberations. Leaders of the corps and its Quds force unit have already been put on the terrorist list, but Republicans have advocated adding the corps itself to send a message to Iran.

The IRGC is by far Iran’s most powerful security entity, which also has control over large stakes in Iran’s economy and huge influence in its political system.

The Iran part of the plan has strong support within the White House, but momentum behind the Muslim Brotherhood proposal seems to have slowed in recent days amid objections from career officials at the State Department and the National Security Council, who argue that there is no legal basis for it and that it could alienate allies in the region. Former officials said that they had been told the order would be signed Monday but that it had now been put off at least until next week.

The delay may reflect a broader desire by the White House to take more time with executive actions after the chaos associated with hastily issued orders, like the temporary ban on visitors from seven predominantly Muslim countries. But it also underscored the complex dynamics involving the Muslim Brotherhood, whose chapters have only loose relationships across national lines.

Critics said they feared that Trump’s team wanted to create a legal justification to crack down on Muslim charities, mosques and other groups in the US. A terrorist designation would freeze assets, block visas and ban financial interactions.

“This would signal they are more interested in provoking conflict with an imaginary fifth column of Muslims in the US than in preserving our relationships with counterterrorism partners like Turkey, Jordan, Tunisia and Morocco, or with fighting actual terrorism,” said Tom Malinowski, an assistant secretary of state under Obama.

The Brotherhood has long been a source of alarm on the right, especially at Breitbart News, whose chairman, Stephen K. Bannon, is now Trump’s chief White House strategist. A 2007 summary for a film Bannon proposed making on radical Islam in America, obtained by The Washington Post, called the Brotherhood “the foundation of modern terrorism.”

Sebastian Gorka and Katharine Gorka, two Breitbart contributors who have long warned of Muslim extremists in the US, also joined the new administration. Sebastian Gorka is a deputy national security assistant, while Katharine Gorka is working at the Department of Homeland Security.

Frank Gaffney Jr., founder of the Centre for Security Policy, who once asserted that Obama might secretly be a Muslim, urged Trump on Breitbart’s radio show last week to designate the Muslim Brotherhood as a terrorist organisation. He has argued that the Brotherhood’s philosophy mirrors that of groups that are already on the list.

“The goals of the Muslim Brotherhood,” Gaffney said in a recent interview with The New York Times, are “exactly the same as [Daesh], exactly the same as the Taliban, exactly the same as, you know, Al Qaida, Boko Haram, Al Nusra Front, on and on, Al Shabab. It’s about Islamic supremacism. It’s about achieving the end state that is their due.”

Some congressional Republicans reintroduced legislation last month calling on the State Department to designate the Brotherhood as a terrorist organisation or explain why it would not. “It’s time to call the enemy by its name,” Sen. Ted Cruz of Texas, who sponsored the measure with Rep. Mario Diaz-Balart of Florida, wrote on Twitter.

Among those objecting is the Council on American-Islamic Relations, which describes itself as the largest Muslim civil rights organisation in the United States. Gaffney and others have accused it of being a front for the Brotherhood, which the council denies. It said such an order by Trump would be a brazen attempt to repress Muslims.

“We believe it is just a smoke screen for a witch hunt targeting the civil rights of American Muslims,” said Ebrahim Hooper, a spokesman for the council. He said that given what he called false attempts to link Muslim Americans to the Brotherhood, a terrorist designation would “inevitably be used in a political campaign to attack those same groups and individuals, to marginalise the American Muslim community and to demonise Islam.”

It is unclear what form a presidential order would take. Presumably, Trump could direct Secretary of State Rex W. Tillerson to review whether the Brotherhood should be designated. At his confirmation hearing, Tillerson grouped the Brotherhood and Al Qaida together as “agents of radical Islam.”

But officials may try to narrow the scope of such an order to avoid affecting Brotherhood affiliates outside Egypt, or they may shelve the order in favour of waiting for legislation from Congress.

Founded in 1928 in Egypt, the Brotherhood used violence for decades in pursuit of its Islamist goals but officially renounced it in the 1970s and embraced democracy as its means.

In recent years, offshoots have joined the political system, including Al Nahda, a party that belongs to the governing coalition in Tunisia and has eschewed extremism. Even in Turkey, a Nato ally, President Recep Tayyip Erdogan’s Justice and Development Party has long supported the Muslim Brotherhood.

The Brotherhood’s most successful period ended in 2013, when President Mohammad Mursi of Egypt, who had succeeded Mubarak, alienated other sectors of society and, after protests, was removed by the military. The general who took over, President Abdul Fattah Al Sissi, has cracked down on the Brotherhood and lobbied the United States to designate it as a terrorist organisation.

From 2013 through mid-2015, a former US official said, every interaction with Egyptian leaders included pressure on the issue. At one point, a senior Egyptian intelligence official personally brought a dossier to Secretary of State John Kerry, although none of the information in it was new, according to the former US official. The State Department decided the Brotherhood did not meet the legal requirements for the designation because there was no evidence that its leaders had systematically ordered terrorist attacks.

A similar review released by Britain in 2015 found that the Brotherhood “selectively used violence and sometimes terror in pursuit of their institutional goals” and that it emphasised engagement in English but jihad in Arabic. Its leaders have defended Hamas’ attacks on Israel and justified attacks on US forces in Iraq and Afghanistan, the review said. But it did not recommend that it be designated as a terrorist organisation, either.

In his short time in office, Trump has already come under pressure from Arab allies eager for such a designation.

A top Arab official, who spoke on the condition of anonymity according to diplomatic protocol, declined to discuss what was said on the calls but added, “It’s safe to assume since UAE, Saudi and Egypt have all designated the MB [Muslim Brotherhood] as a terrorist organisation, that decision would be welcome by those countries and several others in the region.”