The Arab Parliament has urged Nauru to reconsider its decision to recognise Jerusalem as the capital of Israel.
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The switch from Tel Aviv was announced last month by Nauru and follows a controversial 2017 decision by US President Donald Trump.
The Arab Parliament, which represents 22-member states, on Monday rejected the move as a violation of international law.
Xinhua reports Speaker Mishaal bin Fahm Al-Salami calling on Nauru to respect UN resolutions on the legal status of East Jerusalem.
Palestinian officials have also condemned Nauru's decision.