The strike followed a rapid Salvadoran buildup. Bukele deployed more than 2,000 soldiers after four Salvadoran troops disappeared.
He first said the deployment was meant to bring home four Salvadoran GSF soldiers who went missing in an ambush on October 18.
More recently he has hinted at a wider goal: eliminating Haiti's powerful gangs, as he did in El Salvador in a campaign that has drawn allegations of rights abuses.
The prime minister nonetheless gave him strong backing. He told reporters,"We support him in all matters of logistics and intelligence, and we will continue to support him for the work they are doing.".
Thousands of Salvadoran troops flown into Haiti since last month have effectively doubled the contingent of foreign soldiers operating there.
The scale of that deployment has raised concerns over rules of engagement and over coordination with a U.N.-backed force already combating Haiti's gangs.