WASHINGTON – The Senate prepared to vote this week on a trimmed-down Republican coronavirus relief package, though it only has a slim chance of passage in the face of Democrats' insistence for more sweeping aid.Senate Majority Leader Mitch McConnell released the approximately $500 billion measure on Tuesday as senators returned to Washington for an abbreviated pre-election session, but hopes were dimming for another coronavirus relief bill — or much else.Republicans struggling to retain their Senate majority this fall have been divided, with some GOP senators in close races anxious to respond further to the pandemic, even as conservatives are tiring of all the spending and passing legislation in concert with liberal House Speaker Nancy.