The Senate will begin debate over President Biden’s $1.9 trillion coronavirus relief package on Friday morning, kicking off a flurry of activity aimed at getting a final bill to the president’s desk before several key relief programs expire on March 14. The 628 page Bill enjoys support from all 50 Senate Democrats, but Republicans are aiming to make its passage as difficult as possible by forcing votes on a dozens of amendments in a grueling process that could extend into the weekend.