Washington DC. Former US President Joe Biden launched a sharp political attack on current President Donald Trump at a gala event on Saturday. Biden, using Trump's proposed plans as a basis, referred to his successor Trump as a 'loser' in Washington DC.Speaking at a Democratic Party fundraising event in Hanover, Maryland, Biden harshly criticized Trump for 10 minutes. He specifically opposed Trump's plan to build a ballroom at the White House and the approach taken to renovate the city's Reflecting Pool. Biden's remarks are seen as his most direct and sharpest attack to date.At the event, Biden sarcastically commented on...