Saudi Arabia yesterday kept pushing for Sunni Muslim Middle East countries to set aside differences over political Islam and focus on what it sees as more urgent threats from Iran and Islamic State.

Its new monarch, King Salman, has used summits with leaders of all five Gulf Arab states, Jordan, Egypt and Turkey over the past 10 days to reinforce the need for unity and find a way to work around disagreements over the Muslim Brotherhood.

Saudi Arabia’s deep-seated mistrust of the Islamist group is unchanged, diplomats say. But King Salman’s approach to it is more nuanced than that of his predecessor King Abdullah, who died in January, and may include being more indulgent of allies who allow its members space to operate.

Last year Riyadh, along with the United Arab Emirates and Bahrain, withdrew its ambassador from Qatar over its links to the Brotherhood.

“The Saudis think maybe, if the Sunnis are on good terms, we can confront this. Salman is trying to consolidate the Sunni world and put differences over the Muslim Brotherhood on the back burner,” said an Arab diplomat in the Gulf.

Riyadh’s bigger concern is Shi’ite Iran. Its fears about the rising influence of its main regional enemy have grown recently as Tehran’s Houthi allies seized swathes of Yemen and its commanders have aided Shi’ite militias fighting in Iraq. Prospects are also growing of a deal between world powers and Iran on Tehran’s disputed nuclear programme, which might lift pressure on the Islamic republic. Saudi Arabia has watched nervously as its key ally, the United States, has reached out to pursue an agreement with Tehran.

US Secretary of State John Kerry yesterday reassured the Saudis that he was seeking no “grand bargain” with Iran, but Riyadh’s worries over Washington’s long-term commitment to the region underpin its desire for more Arab unity.

The second overarching concern for Riyadh is Islamic State. IS has called on Saudis to stage attacks inside the kingdom and some of its sympathisers assaulted a Shi’ite village in November, killing eight.

Riyadh fears the group’s strong media messaging and appeal to strict Muslim ideology could appeal to disaffected young Saudis and challenge the ruling family’s own legitimacy, which partly rests on its religious credentials.

But in seeking broader unity across the Arab world on the issue of political Islam, Saudi Arabia must address a deep regional rift. It runs between Sunni states who accept a Muslim Brotherhood presence, such as Qatar and Turkey, and those such as Egypt and the United Arab Emirates who, like Riyadh, describe it as a terrorist organisation.

Those differences have come in the way of building a coherent response to regional crises, as attempts to several problems have been diverted into arguments over Islamism.

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