Jordan's government spokesman warned on Thursday of "catastrophic" repercussions if President-elect Donald Trump makes good on a campaign promise to move the U.S. Embassy in Israel to contested Jerusalem.

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Such a move could affect relations between the U.S. and regional allies, including Jordan, Information Minister Mohammed Momani told The Associated Press, addressing the issue publicly for the first time.

An embassy move would be a "red line" for Jordan, would "inflame the Islamic and Arab streets" and serve as a "gift to extremists," he said, adding that Jordan would use all possible political and diplomatic means to try and prevent such a decision.

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The U.S. considers pro-Western Jordan as an important ally in a turbulent Mideast. The Hashemite kingdom is a key member of a U.S.-led military coalition against Islamic State extremists in neighboring Syria and Iraq, and maintains discreet security ties with Israel.

Jordan also has a stake in Jerusalem, serving as custodian of Islam's third holiest shrine in the city's eastern sector.

Israel captured east Jerusalem from Jordan in 1967 and annexed it to its capital. The Palestinians want to establish the capital of a future state in the city's eastern sector. Addressing the conflicting claims in the city would be central to any renewed Israeli-Palestinian negotiations on the terms of Palestinian statehood.

Jerusalem looms large in rival Israeli and Palestinian national narratives, and disputes over holy sites there have sparked several rounds of deadly violence over the years.

Much of the world has not recognized Israel's annexation of east Jerusalem and most countries, including the United States, maintain their embassies in Tel Aviv, Israel's vibrant commercial center and seaside metropolis.

Momani, the Jordanian minister, said that moving the U.S. Embassy to Jerusalem "will have catastrophic implications on several levels, including the regional situation." He said countries in the region would likely "think about different things and steps they should take in order to stop this from happening."

"It will definitely affect the bilateral relationship between countries in the region, including Jordan, and the parties that will be related to such a decision," he said.

Trump said during the presidential campaign that he intended to move the U.S. Embassy to Jerusalem.

Last month, Trump adviser Kellyanne Conway was quoted as saying that moving the embassy to Jerusalem is a "very big priority" for the president-elect.

Trump's choice for U.S. ambassador in Israel, David Friedman, has said he looks forward to working from Jerusalem.