Jordan’s government spokesman warned on Thursday of “catastrophic” repercussions if President-elect Donald Trump follows through on a campaign promise to move the US Embassy in Israel to Jerusalem.

Such a move could affect relations between the US and regional allies, including Jordan, Information Minister Mohamed 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 would serve as a “gift to extremists,” he said, adding that Jordan would use all possible political and diplomatic means to prevent such a decision.

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

Momani, the Jordanian minister, said that moving the US 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.

Donald Trump said during the presidential campaign that he intended to move the US Embassy to Jerusalem.

Read more at Times of Israel