Sen. Bernie Sanders took to Twitter Thursday to blast former President Donald Trump and his recent praise of Russian President Vladimir Putin, calling it “outrageous, if unsurprising.”

“It is outrageous, if unsurprising, that Trump would praise Putin’s murderous invasion of Ukraine as an act of ‘genius,’” Sanders tweeted. “It should concern us all that Putin is exactly the kind of leader Trump would like to be, and that so few Republicans have the courage to say this out loud.”