French President Emmanuel Macron on Sunday criticized President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE over his decision to withdraw U.S. forces from Syria, saying that "an ally should be dependable."

Macron added that fighting "shoulder to shoulder" is the "most important thing for a head of state."

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“I very deeply regret the decision made on Syria,” Macron said during a news conference, according to Reuters.

“To be allies is to fight shoulder to shoulder. It’s the most important thing for a head of state and head of the military," he added. "An ally should be dependable.”

Macron also emphasized that Kurdish forces in Syria, whom the U.S. forces have supported, have done important work, Reuters reported.

“I call on everyone ... not to forget what we owe them,” he said.

Trump last week announced that the U.S. would withdraw its troops from Syria, fulfilling a pledge he had made for years. In doing so, Trump declared that the U.S. had defeated the Islamic State in Iraq and Syria (ISIS) in the region.

Trump's move was met with bipartisan criticism from lawmakers, who have said that ISIS has not yet been defeated.