BELGRADE - Hundreds of Serbian ultra-nationalists protested on Tuesday against US Vice President Joe Biden's visit to Belgrade by chanting their support for the man he says is making the United States less safe - Donald Trump."Vote for Trump! Vote for Trump!" the protesters, wearing T-shirts displaying an image of the US Republican candidate, shouted as they gathered near the Serbian presidency building.Biden was on a one-day visit to Belgrade before travelling to Kosovo, with officials saying he will encourage both countries to do more to normalise their relations. Kosovo declared independence from Serbia in 2008.