U.S. Republican Senator Lindsey Graham took aim at French President Emmanuel Macron for his “cavalier” remarks on European Deash/ISIS fighters.

“Very disturbed by the cavalier remarks made by President Macron about how the number of European ISIS fighters in Syria is a small problem in the grand scheme of things,” Graham said on Twitter.

Graham’s rebuke came a day after U.S. President Donald Trump clashed with Macron over the repatriation of Daesh/ISIS terror group fighters currently held in northeastern Syria.

Speaking to reporters during a NATO leaders summit in London, Trump criticized Europe’s reluctance to take back its nationals,

Read more: US senator slams Macron on Daesh fighters comments