PRESIDENT Rodrigo Duterte again lashed out at former Foreign Affairs secretary Albert del Rosario after the latter claimed that China helped him win the presidency in 2016.

In his public address on Monday, Duterte denied del Rosario's claim.

"Anong China, China magtulong sa akin? G*** ka, saan mo nakuha 'yan? Sixteen... 16 million makuha mo ng tulong sa ibang bayan? Sixteen million mabili mo (What have you been saying that China helped me? You're stupid; where did you get that? Can you ask another country to help you with that? Can you buy 16 million votes)?" the President said, referring to the number of votes that he garnered in the race to Malacañang five years ago.

Del Rosario, in a recent media forum, said he had received information that high officials from China are bragging that they had been able to influence the 2016 elections so that Duterte would be President.

Del Rosario is guilty of treason for "transmitting" the message, according to Duterte.

"Ikaw ang hahabulin ko kasi ikaw ang nag-transmit sa message (I will run after you because you were the one who transmitted the message)," he said

Duterte then asked del Rosario where he could meet him so he could pour a cup of coffee on his face.

"I want to see you personally. Where can I meet you? Saan ka ba nagkakape-kape? Ibuhos ko 'yang kape sa mukha mo, maniwala ka. Hindi ka maniwala? Subukan mo (I want to see you personally. Where can I meet you? Where do you go to have coffee? I will pour coffee over your face, believe me. You won't believe me? Then try)," the President said.

"Try conveying to me the message where I can find you at pupuntahan kita. Hindi ako magdala ng security, ako lang (I will visit you. I will not bring my security personnel)," Duterte added.

He previously criticized del Rosario and blamed him for the loss of Scarborough Shoal to China during a standoff there in 2012, when the latter was chief of the Department of Foreign Affairs.

In response, del Rosario earlier said it was China that should be blamed, as it breached an agreement with the Philippines to withdraw vessels from the disputed area to ease tensions during the standoff.

In a media forum last Monday, he said Duterte betrayed his constitutional duty to uphold the country's national interest by shelving the Philippines' arbitral win against China over the West Philippine Sea (South China Sea).

Malacañang denied this, saying Duterte made efforts to assert the ruling in his previous speeches before the United Nations.

"Kalokohan po iyan coming from a proven traitor (That's a joke coming from a proven traitor)," it said.

"Siya po ang nagpaalis sa ating mga kasundaluhan, sa Boro (Scarborough Shoal) na naging dahilan na ang Tsina na lang ang natira sa Boro. Mr. Del Rosario, if you want to talk about who that real traitor is, ikaw iyon (He was the one who ordered the soldiers to withdraw from Scarborough Shoal. That is why China was the only one left there. Mr. Del Rosario, if you want to talk about who that real traitor is, that is you)!" Malacañang spokesman Harry Roque Jr. said in his briefing last week.

Roque urged lawyers and other groups to study the legal liability of del Rosario in "ceding Scarborough Shoal to China."