Former President George W. Bush appeared to take aim at President Donald Trump Thursday, saying there is “pretty clear evidence that the Russians meddled” in the 2016 presidential election.

USA Today cites Bush’s comments at a talk in Abu Dhabi. The former president didn’t directly name Trump. Trump has consistently disputed allegations of Russian interference in the election, or that members of his campaign in any way colluded with Moscow. Bush said it was “problematic” that a foreign country was “involved in our election system” but also said it was “another question” whether the vote’s outcome was affected.