Palestinian Authority President Mahmoud Abbas’s office warned Friday of the potential destructive effects if US President Donald Trump recognizes Jerusalem as the capital of Israel, a move they say would deny their claim to East Jerusalem as the capital of their future state.

“The American recognition of Jerusalem as the capital of Israel destroys the peace process,” Abbas’s spokesman Nabil Abu Rudeineh said in a statement to AFP.

“The American recognition of Jerusalem as Israel’s capital and moving the American embassy to Jerusalem involves the same level of danger to the future of the peace process and pushes the region into instability,” he said.

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The warning comes as Trump is due to decide by Monday on whether to move his country’s embassy from Tel Aviv to the disputed holy city.

Reports emerged on Friday that Trump could again delay moving the embassy but recognize Jerusalem as the capital of Israel.

The Palestinians see East Jerusalem as the capital of their future state and fiercely oppose any changes that could be regarded as legitimizing Israel’s control over East Jerusalem, which it captured in the 1967 Six Day War.

Without referring to Trump by name, Abu Rudeineh said any just solution in the Middle East required recognition of East Jerusalem as the capital of an independent Palestinian state.

“East Jerusalem, with its holy places, is the beginning and the end of any solution and any project that saves the region from destruction,” he said in an earlier statement on the official Wafa news agency.

Israel annexed East Jerusalem and claims all of Jerusalem as its undivided eternal capital.

This has not been recognized by the international community. No countries currently have their embassies in Jerusalem, instead keeping them in the Israeli commercial capital Tel Aviv.

Trump is due to decide by Monday on whether to renew a six-month waiver on moving the embassy. He pledged during his campaign to move the embassy to Jerusalem but renewed the waiver in May.

The US leader has said he wants to relaunch frozen peace talks between Israel and the Palestinians in search of the “ultimate deal”

Any major shift in US policy would make that goal more difficult to achieve, Middle East analysts say.

The Times of Israel Staff contributed to this report