Actor David Boreanaz caused an uproar on Twitter Wednesday night by getting political with a tweet critical of President Obama, insisting the nation’s chief executive needs to stand up to Russia’s Vladimir Putin and “grow some.”

The co-star of FOX’s crime drama Bones took a break from promoting his show at Comic-Con in San Diego to write, “so here we are in a Cold War now with Russia. Sanctions aren't going to cut it. Putin is Nuts and a serious threat to the USA.” The tweet garnered 901 retweets and 1,571 favorites.