MANILA (UPDATE)—President Rodrigo Duterte on Tuesday night warned that he will slap a foreign human rights advocate if he enters the country to help Vice President Leni Robredo end the drug war.

"P******** Leni, sa harap mo sampalin ko 'yan," he said in a press briefing in Malacañang Palace.

"I dare you, kung talagang dedicated ka, papasukin mo dito ang p********** 'yan. Pupuntahan kita sa opisina mo, sampalin ko 'yan sa harap mo," he added.

The President said he saw Phelim Kine's Nov. 11 tweet to Robredo making a recommendation on arresting him and his supporters for allegedly instigating a "mass murder."

"Dear VP @lenirobredo - my bags are packed and I'm ready to come to the #Philippines to help advise how to end this murderous "drug war," the former deputy director for Asia of the New York-based Human Rights Watch wrote on Twitter.

"Meanwhile here is my Recommendation No. 1: Arrest #Duterte and his henchmen for inciting & instigating mass murder," he added.

Dear VP @lenirobredo - my bags are packed and I'm ready to come to the #Philippines to help advise how to end this murderous "drug war." Meanwhile here is my Recommendation No. 1: Arrest #Duterte and his henchmen for inciting & instigating mass murder https://t.co/adVEP2lTsq https://t.co/FpxxCT7jIn

— Phelim Kine 林海 (@PhelimKine) November 11, 2019

Kine, who is now a director of research and investigations at the Physicians for Human Rights, has been critical of the Duterte administration's campaign against illegal drugs and alleged disregard for basic human rights.

The President said he was irked by Kine's comments because he was "not being given the opportunity to be heard."

"Of course, I tried answering, I tried to mga disclaimer, nobody is listening," he said.

Robredo, however, earlier said her office had not sent or received any invitation or letter to or from Kine.

"Wala namang imbitasyon, walang sulat sa amin so mahirap mag-comment. Sa amin lang, lahat ng makakatulong welcome,” she said.

• Palace backs Locsin's call to deny rights advocate entry to PH over drug war criticism