Former Philippine President Rodrigo Duterte made an unannounced visit to Hong Kong on Sunday, leading to questions about whether he is attempting to evade a possible arrest warrant by the International Criminal Court over his extrajudicial killings amid his war on drugs during his time in office.

Duterte, 79, and his daughter — incumbent Philippine Vice President Sara Duterte — were the main speakers at a campaign rally at the Southorn Stadium in the busy Wan Chai commercial district in Hong Kong for the senatorial candidates of his political party, Partido Demokratiko Pilipino, ahead of the May 12 midterm elections in the Philippines.

In his speech, Duterte addressed reports about the ICC possibly issuing a warrant for his arrest, reiterating previous comments that he was prepared to be jailed if his arrest is ordered.

"If that’s my fate, that’s fine. I will accept it. We can’t do anything if I’m arrested or imprisoned," he said in front of a crowd of Filipino supporters.

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The ICC has been investigating the large number of killings by police and gunmen under Duterte's crackdown against illegal drugs during his tenure as president from 2016-2022. Thousands of people, most of whom were poor, were left dead as he sought to carry out his war on drugs.

Duterte, while in office, also prosecuted a journalist for coverage that scrutinized the government's killings.

The former populist president has denied he authorized extrajudicial killings. However, he openly and repeatedly threatened to kill suspected drug dealers during his time in office.

"What was my sin?" Duterte asked in his speech in Hong Kong. "I did everything in my time, so Filipinos can have a little peace and tranquility."

He jokingly told the crowd to make small contributions for the construction of his monument, which he said should show him holding a gun.

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A senior Philippine official said the former president was scheduled to fly back on Tuesday to Manila, the capital of the Philippines, but another senior official said he could extend his stay in Hong Kong.

Current President Ferdinand Marcos Jr.'s administration is prepared to handle any situation stemming from an ICC arrest warrant, the president's communications secretary, Jay Ruiz, said.

"We've heard that an arrest warrant has been issued by the International Criminal Court against former President Rodrigo Duterte for crimes against humanity," Ruiz said in a statement. "The government is prepared for any eventuality."

In the southern city of Davao, Duterte's home region, police bolstered security at the international airport and will monitor new checkpoints. Philippine police told reporters the move was part of an effort to ensure law enforcement would be able to handle any contingencies.

Duterte had held office in Davao, previously serving as mayor, vice mayor and member of the House of Representatives. He was also chair of the Davao City Liberal Party from 2009-2015.

Marcos Jr. has said that Philippine law enforcement agencies would be required to fully cooperate if the ICC seeks Duterte's arrest.

The ICC was created in 2002 to serve as a court of last resort for the most serious international crimes, including genocide, war crimes, crimes against humanity and aggression. The ICC becomes involved when countries are unable or unwilling to prosecute crimes within their borders.

About 125 countries have signed the court’s foundational treaty, the Rome Statute. But China, which controls Hong Kong, has not signed on.

Duterte withdrew the Philippines from the ICC in 2019, which activists argued was an attempt to evade accountability and prevent an international investigation into the government-authorized killings. However, the ICC still maintains jurisdiction over alleged crimes committed when the country was a member, so Duterte could still be held accountable for possible crimes committed in the first half of his presidency.

The Associated Press contributed to this report.