The leaders are set to meet with India's Prime Minister Narendra Modi and a high-level US delegation in Port Moresby on Monday.
PNG Prime Minister James Marape told local media on Thursday that President Joe Biden had called to apologise for his absence due to the need to return to Washington for meetings with Congressional leaders to raise its debt ceiling issue and avoid a default.
"He conveyed his sincerest apologies that he cannot make it into our country," Marape said.
