Today's verdict by the Supreme Constitutional Court dismisses previous opposing court rulings, whether in favor of the agreement or against it.
The court, according to state-run MENA news agency's report, said only the legislative authority can approve the agreement.
Egypt's parliament, packed with government supporters, passed the agreement in 2017 and President Abdel-Fattah el-Sissi ratified it shortly afterward.
The deal, signed in 2016, sparked rare protests in Egypt, which has all but banned demonstrations since late 2013.
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