Former MSNBC host Mehdi Hasan on Monday grilled Green Party candidate Jill Stein on whether or not Russia’s Vladimir Putin is a war criminal or not — and the presidential hopeful struggled to offer a straightforward response. Pointing out that Stein hasn’t hesitated to call Israel’s Benjamin Netanyahu a war criminal, the Mehdi Unfiltered host wondered why she had such a difficult time condemning Putin, who invaded Ukraine in 2022. “You called Netanyahu [a war criminal], which I think he is,” Hasan said to Stein. READ MORE: Dem strategist hits Jill Stein with ‘taste of reality’ on ‘the one thin…