Prior to Duterte's election this year, US-Philippine relations had been strengthening. The Supreme Court in January upheld the validity of a defence cooperation pact that gives the US military the right to increase troops deployed to the Philippines for war games, as well as bringing equipment into military areas including Subic Bay, the former site of a US naval facility.
The US has also been a strong supporter of the Philippines as it pushes back against China's assertiveness in the disputed South China Sea. Manila's military forces are dwarfed by China's Navy and coastguard.
"This could just be fallout from the Laos brouhaha," said Richard Bitzinger, who studies the military as a senior fellow at the S. Rajaratnam School of International Studies in Singapore. "It is interesting that he hasn't mentioned the Enhanced Defence Cooperation Agreement. Maybe he wants the US to say it really values its relationship with the Philippines."
These special forces, they have to go. They have to, in Mindanao - there are many white men there
Duterte put the entire country under a so-called state of "lawlessness" following a bombing in his home city of Davao on Mindanao at the start of the month. The measure allows him to use the military to assist the police to fight crime and violence.
Duterte said the presence of US forces could inflame the situation and suggested that they may be kidnap targets or killed by local terrorist groups.
The US hadn't apologised for alleged atrocities committed by Americans on Filipinos in the 1900s, Duterte said, also criticising the US over its role in conflicts in Iraq, Syria and Vietnam. American officials are "hypocrites" for funding anti-drug efforts while calling him out for supposed human-right violations, he said in the same speech.
- Bloomberg