Trump repeatedly criticized the slow pace of progress and promised to introduce a new approach that would hasten ISIL's defeat.
Extremist group has shown a blatant disregard for the rules of war.
Government accused of misleading the public.
The mission entered a critical stage this week with the attack on Mosul.
While Canada pulled its fighter aircraft from the U.S.-led coalition earlier this year, the Canadian Forces still pull its share on the ground. Providing vital support to Peshmerga fighters through "advise-and-assist" operations, Canada has boots on the ground and is actively taking part in the battle.
Canada has about 200 special forces soldiers helping Kurdish forces.
The feds promised small arms, ammunition back in February.
Liberals pulled CF-18s from Iraq and Syria in February.
The Republican nominee said some NATO members aren't spending enough on defence.
Defence Minister Harjit Sajjan was in Washington for the conference.