Manila, July 9 -- President Rodrigo Duterte on Monday said he may educate the public on the constitutionality of his fishing agreement with Chinese President Xi Jinping during his fourth State of the Nation Address (SONA) on July 22.

The October 2016 agreement between Duterte and Xi allows the Chinese to fish within the Philippines' 200-nautical mile exclusive economic zone (EEZ), for as long as China will allow Filipinos to fish in the Panatag (Scarborough) Shoal.

"Sabi nila na (They say it's) unconstitutional, well, you wait. Maybe sa (during the) SONA, I will educate people na 'yung ginawa ko, sabi ko you can fish ano... Tama talaga ako. At hindi maging unconstitutional 'yan. (that what I did, allowing them to fish.I'm actually right. ...