Donald Trump said Russian President Vladimir Putin was “probably” involved in the death of opposition leader Alexei Navalny, who died in an Arctic prison last month.

“I don’t know, but perhaps, I mean possibly, I could say probably, I don’t know,” the U.S. Republican presidential candidate rambled in an interview with Fox News, when asked whether Putin bears responsibility for Navalny’s death.

“He’s a young man, so statistically he’d be alive for a long time … so something happened that was unusual,” Trump added.