Philippine Sen. Ronald dela Rosa, ​the chief enforcer of former President Rodrigo Duterte's deadly "war on drugs," answers questions from journalists at the Senate in Pasay City, Metro Manila, on Tuesday. | REUTERS

The Philippine senator who emerged from hiding to cast a key vote in the country's upper house on Monday has vowed to fight any attempt to execute an International Criminal Court arrest warrant over his role in the country’s notorious war on drugs.

"We will exhaust all available legal means so we will not be brought to The Hague,” Ronald dela Rosa told DZBB radio on Tuesday.

Dela Rosa — popularly known as "Bato,” which means rock in Tagalog — was speaking from the Senate complex, where he won protective custody after being chased through hallways by agents of the National Bureau of Investigation.…