During his election, Trump promised to relocate the U.S. embassy from Tel Aviv to Jerusalem.
"That they claim they want to announce Quds as the capital of occupied Palestine is because of their incompetence and failure", Khamenei said, using the Arabic name for Jerusalem.
Anadolu also reported the Turkish Presidential spokesman, Ibrahim Kalin, calling on the US administration to refrain from recognising Jerusalem as the capital of Israel.
Speaking from Seoul where he met his South Korean counterpart, Yildirim said: "One way or another, both situations will be unlawful decisions and will make the existing problems in the region even more unsolvable".
On Dec. 5, Turkish President Recep Tayyip Erdogan said that Turkey can break off diplomatic relations with Israel in case the US recognizes Jerusalem as the capital of Israel.
There have been suggestions he will stop short of moving the embassy for now but recognise Jerusalem as Israel's capital - a move that would overturn years of precedent and run contrary to international consensus. The recent move has been opposed by a number of world powers, including Turkey and the Arab League.
"Jerusalem is a very delicate subject in the world of Islam".
The recognition will "throw the region and the world into a fire and it's not known when it will end", Bozdag, also government spokesman, wrote on Twitter.
"American government officials have said themselves that we have to start a war in the region to protect the security of the Zionist regime", Khamenei said.
The prime minister said a declaration could cause religious clashes and destroy efforts toward formation of a Palestinian state.
The two sides have since stepped up co-operation, in particular in energy, but Erdogan, who regards himself a champion of the Palestinian cause, is still often bitterly critical of Israeli policy. Last year, Turkey and Israel ended a rift triggered by Israel's deadly storming of a Gaza-bound ship in 2010 that left 10 Turkish activists dead and led to a downgrading of diplomatic ties.
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