President Donald Trump sparked an uproar among leaders across the world after he signaled that he would be recognizing Jerusalem as Israel’s capital and moving the U.S. embassy there, upending decades of American foreign policy and potentially thwarting any hope for Israeli-Palestinian peace talks.

Trump called Palestinian leader Mahmoud Abbas and the leaders of several U.S. allies on Tuesday to break the news. He is expected to formally announce the decision in a speech on Wednesday.

Abbas warned Trump “of the dangerous consequences such a decision would have to the peace process and to the peace, security and stability of the region and of the world,” Abbas’ spokesman Nabil Abu Rudeina said in a statement after Trump’s call. The Palestinian leader also called for three days of protest beginning Wednesday.

The embassy move would represent the “kiss of death” to the Israeli-Palestinian peace process, said Manuel Hassassian, the Palestinian representative to Britain ― an issue Trump has delegated to Jared Kushner, his son-in-law and adviser. Jordan’s King Abdullah II and Saudi Arabia’s King Salman made similar warnings.

“Mr. Trump, Jerusalem is the red line of Muslims,” Turkey’s President Tayyip Erdogan said Monday. He additionally threatened to cut Turkey’s diplomatic ties with Israel. The Arab League also opposed the move, with Secretary General Ahmed Aboul Gheit saying it was a “dangerous measure that would have repercussions.”