Trump invited to PNG for APEC 2018

US President Donald Trump has been formally invited to Port Moresby for the APEC leaders summit in 2018.

Donald Trump has been formally invited to Port Moresby for the APEC leaders summit in 2018. (AAP)

Papua New Guinea has formally invited new US President Donald Trump to Port Moresby for the APEC leaders summit next year.

Prime Minister Peter O'Neill wrote to Mr Trump inviting him to join the 20 other leaders at the Asia Pacific Economic Cooperation talks in November 2018.

"APEC is a forum to expand investment, break down unjust bureaucratic regulation to trade, and to confront issues that threaten our shared economic stability and security," Mr O'Neill said in a statement.