Nauru is hosting the summit in September and it had said it was planning to lift punitive restrictions on access for journalists that have been in place for nearly four years.
Nauru charges more than $US6,000 for a non-refundable visa application, yet it is not known how much money the policy has collected.
The effective ban was imposed after the Nauru government took exception to criticism from the international media over the treatment of Australia's asylum seekers on the island.
