MANILA, Philippines (AP) — The former head of the Philippine National Police force will be summoned as part of a new investigation into alleged extrajudicial killings during anti-drug crackdowns ordered by ex-President Rodrigo Duterte , Interior Secretary Juanito Victor Remulla Jr. said Sunday. Ronald dela Rosa, who is now a senator, will be summoned on Monday, Remulla said. The thousands of killings of mostly impoverished drug suspects took place when Duterte was mayor of the southern city of