NAP is a major coalition partner in the current government. The first term MP said his resignation is on popular demand from his 700, 000 people who are unhappy with current goverment of Prime Minister Peter O'Neill.
"I have resigned from NAP yesterday, April 13, 2016.
"My letter of resignation has been delivered to the party's Secretary Stephen Pokawin and the officers of the Registrar of Political Parties.
"I have also personally met with the NAP leader Patrick Pruaitch yesterday to explain my actions," Kua told a media conference in Port Moresby today.
He added that after a failed vote of no-confidence for the third time he had to leave the government.
"I will no longer support a government led by Peter O'Neill which is destroying the country, the economy and it's standard of governance and accountability," Kua said.
"The people of Sinasina Yongomulg expect a higher standard of behaviour from the Office of the Prime Minister. In our standard judgement the prime minister standard set by O'Neill is the lowest ever by any prime minister since independence," Kua said.
He added that he is a free MP now and will reveal his next intentions in the coming week.