By David Morgan and Richard Cowan WASHINGTON (Reuters) – The U.S. Senate voted on Thursday to take up President Joe Biden’s $1.9 trillion coronavirus aid bill, setting up what is likely to be a contentious, days-long debate over the merits of the sweeping package. The party-line vote of 51-50, with Democratic Vice President Kamala Harris breaking the tie, illustrated that Democrats who narrowly control the chamber can expect little, if any, Republican support. A vote on final passage could come over the weekend. Republicans are expected to use procedural tricks to drag out the process for as l…