Reuters - Iran�s supreme leader Ayatollah Ali Khamenei said on Wednesday that U.S. President Donald Trump�s peace plan for the Israel-Palestinian conflict was doomed to fail and all Muslim nations should oppose it.

�The devilish and vicious policy of America toward Palestine called the �deal of the century� will never materialize...all Muslim nations will confront them and will not let it materialize,�� Ayatollah Khamenei said a tweet written in Farsi.

Trump on Tuesday announced a U.S. peace plan which would set up a Palestinian state with strict conditions but allow Israel to take over long-contested Jewish settlements in the occupied West Bank. Palestinian leaders have rejected it as biased toward Israel.

Opposition to Israel is a cornerstone of Iranian policy, which backs Palestinian groups.

Writing by Parisa Hafezi; Editing by Angus MacSwan