AP � Iran�s President Hassan Rouhani criticized Saudi Arabia on Wednesday over what he called �unprecedented� interference in Lebanese affairs and added his voice to those who suspect the Gulf kingdom forced Lebanon�s prime minister to resign.

Rouhani�s remarks followed a phone call to his Lebanese counterpart the previous day, in which the Iranian president pledged Tehran�s support for Lebanon�s stability following the resignation of the Saudi-backed Prime Minister Saad Hariri.

The surprise resignation threw the Lebanese government into disarray and exposed a new front for the tensions between the Sunni powerhouse and its archrival Shiite-led Iran.

�Why are you interfering with Lebanon�s internal affairs and governance,� Rouhani said, addressing Saudi Arabia, according to his official website.

�There is no case in history that a country forces another one�s authority to resign only to interfere (in) their internal affairs,� Rouhani added. �This is an unprecedented event in history.�

Hariri unexpectedly announced from Saudi Arabia he was resigning on Saturday and in a televised speech accused Iran of meddling in Arab affairs and the Iran-backed Lebanese militant group Hezbollah of holding Lebanon hostage. Hezbollah has members in the Lebanese unity government that Hariri formed last year.

The resignation was followed by harsh Saudi official statements, including accusations against the Lebanese government of waging a war on the kingdom. Iranian officials called the resignation a �plot� by the United States, Israel and the Saudis to foment tensions in Lebanon and the region.

Casting himself as the voice of reason, Rouhani also questioned the benefits of Saudi Arabia�s �hostility toward the peoples of the region� and urged the kingdom to choose �friendship� instead.

�You are making mistake if you think Iran is not your friend and the U.S. and Israel are your friends,� Rouhani also said, according to the semi-official ISNA news agency. �This is a strategic miscalculation.�

Sunni-led Saudi Arabia, under Crown Prince Mohammed bin Salman, has been intensifying its confrontation with Shiite power Iran. The two camps support rival sides in countries across the region, as well as in the wars in Yemen and Syria.

In his call to Lebanese President Michel Aoun late Tuesday, Rouhani said Iran firmly believes the Lebanese people will overcome �this sedition� and �will not allow Lebanon to become a battlefield for foreign powers and an opportunity for the terrorists to re-emerge.�

According to Rouhani�s website, Aoun told him that Lebanon is going through a �difficult� situation but that peace is still in place despite �some very weak voices that want to create tensions.�

Washington has said it had no indication that Hariri would resign and pledged to continue U.S. support for the Lebanese government.

�Our relationship with the government will not change,� U.S. State Department spokeswoman Heather Nauert told reporters on Tuesday. She added that Washington considers Hezbollah a terrorist organization.

Washington has recently imposed new sanctions on the Shiite group, including a bounty on two of Hezbollah�s senior military commanders.

�The United States strongly supports the legitimate institutions in the Lebanese state. We expect all members of the international community to respect those institutions and the sovereignty and the political independence of Lebanon,� Nauert said

The bizarre circumstances surrounding Hariri�s resignation left Lebanese politicians grappling to find a way out of a political deadlock. The president has yet to officially accept the resignation amid calls for Hariri to return to Lebanon. In his speech, Hariri said he feared for his life, but security officials have said they had no indication there were threats against the prime minister.

On Wednesday, Aoun met with World Bank officials who reiterated their support for the Lebanese government. Regional Director Saroj Kumar Jha said World Bank�s support for Lebanon�s infrastructure, health, education and development has exceeded $2 billion.

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Associated Press writers Nasser Karimi in Tehran, Iran, and Matthew Lee in Washington contributed to this report.