 Biden says Trump bowed down to a Russian dictator, Putin. US President Joe Biden has slammed his predecessor Donald Trump's comments regarding NATO, accusing the Republican front-runner of bowing down to Moscow by saying Washington should refuse to defend its European allies that fail to fulfill their military spending commitments. Trump's suggestion during a rally that he had told an unnamed NATO member Russia could do whatever the hell they want with the country because it hadn't paid its bills was dumb, Biden insisted. It's shameful. It's dangerous. It's un-American. Imagine a former president of the United States saying that the whole world heard it. The worst thing is he means it. The US leader continued, claiming that Trump's remarks meant he had bowed down to a Russian dictator. When America gives its word, it means something. When we make a commitment, we keep it and NATO is a sacred commitment. Biden claimed Donald Trump looks at this as if it's a burden. Biden had already denounced his rival's remarks, calling them appalling and dangerous. On Sunday, in that statement, the president claimed his predecessor had effectively said he would abandon NATO allies if Russia attacks and give Russian president Vladimir Putin a green light for more war and violence.