President Rodrigo Duterte has asked world leaders to prioritize the war against terrorism and extremism.
He also asked the heads of state to fight security threats like piracy and illegal drugs.
He made these requests during his opening statement at the plenary session of the ASEAN Summit.
The event is being held at the Philippine International Convention Center (PICC) in Pasay City on Monday.
Duterte said, "I apologize for setting the tone of my statement in this matter," but he told the world leaders that their session this morning is a great opportunity to discuss urgent security issues in the region.
He related the Philippines' experience in the Marawi siege staged by ISIS-inspired Maute terrorists.
Duterte is presiding over the plenary session.
Meanwhile, the bilateral meeting between him and United States (US) President Donald Trump has been reset to 12:50 this noon from the original schedule of 11:50 am.
The schedule was adjusted after there was delay in the time alloted for the opening ceremonies.
Presidential Spokesperson Harry Roque will give a briefing on the result of the bilateral talks later in the day.