US President Joe Biden has criticized his predecessor Donald Trump’s recent statements on NATO in harsh terms. “For God’s sake, it’s dumb, it’s shameful, it’s dangerous, it’s un-American,” Biden said on Tuesday in response to Trump’s announcement that he would not grant protection from Russia to NATO partners who do not fulfil their financial obligations. “No other president in our history has ever bowed down to a Russian dictator,” Biden criticized. “Let me say this as clearly as I can: I never will.” Trump, who wants to challenge Biden in the next presidential election in November, said at a…