I am a very good mediator, " the deal-making American leader told Vietnamese President Tran Dai Quang during an official state visit.
With China's provocative actions in the South China Sea, Roque said the issue is expected to be discussed by the two leaders. "See you tomorrow", Trump was quoted yesterday as telling Duterte when they bumped into each other during a break at the Asia-Pacific Economic Cooperation (APEC) Leaders' Forum here.
Duterte also said he "might" raise the issue of the South China Sea dispute with Trump, alongside trade, Islamic extremism and terrorism, according to a statement.
U.S. Navy ships have also carried out freedom of navigation patrols in the area, angering China. He had bilateral meetings with Putin and Chinese President Xi Jinping.
The US President, who expressed his great friendship with Chinese president Xi Jinping in the early stage of his Asia tour, acknowledged in Vietnam that China's position on the South China Sea, almost all of which is claimed by Beijing, was a problem.
The Philippines will be Trump's last stop on a marathon tour that has taken him to Japan, South Korea, China as well as Vietnam.
"While the South Korean people are opposing war threats against the north and demanding peace in the region, here is the president of the Philippines who could not even commit to peace in his own country, allowing the country as a launching pad of United States aggression and putting the Filipino population to the danger of nuclear obliteration", he said in a statement.
U.S. President Donald Trump landed in the Philippines on Sunday for a summit of Southeast and East Asian nations, hours after offering to mediate on competing claims to the South China Sea that have long stoked tensions in the region.
In August, foreign ministers of Southeast Asia and China adopted a negotiating framework for a code of conduct in the South China Sea, a move they hailed as progress but one seen by critics as a tactic to buy China time to consolidate its power.
China is a signatory to the United Nations Convention on the Law of the Sea (UNCLOS), which sets territorial limits at 10 miles, with a 200-mile economic exclusion zone from a country's coast.
It's claims are based on its traditional "nine-dash line" - waters that extend hundreds of miles to the south and east of its island province of Hainan, abut its neighbors' claims and, in some cases, encroach upon them.
An global tribunal has also ruled against China's maritime claims but Beijing has refused to recognize the court's ruling.