Saudi Arabia hosts the G20 summit on Saturday, in a first for an Arab nation. The virtual forum is likely to be dominated by efforts to tackle the coronavirus pandemic along with a crippling global economic crisis. The two-day meeting of the world's wealthiest nations comes as President Donald Trump refuses to concede a bitter election. World leaders will focus on efforts to intensify a large-scale roll out of coronavirus vaccines, as calls grow for G20 nations to plug funding shortfalls. The G20 summit is usually an opportunity for one-on-one engagements between world leaders, but this year it has been reduced to brief online sessions.