Update (2115ET): Senate Democrats were able to successfully block the coronavirus stimulus package from moving forward as five GOP senators were absent due to coronavirus or precautionary self-quarantine.

Senators voted 47-47 on advancing a "shell" bill, a placeholder that the text of the stimulus legislation would have been swapped into, falling short of the three-fifths threshold needed to advance the proposal.  

Hopes of a quick stimulus deal quickly unraveled on Sunday as the four congressional leaders and Treasury Secretary Steven Mnuchin failed to break the impasse. Senate Majority Leader Mitch McConnell (R-Ky.) also delayed the procedural vote for three hours as they tried to get a deal. -The Hill

Senator Rand Paul (R-KY) was not present after announcing Sunday morning that he had contracted coronavirus and would self-quarantine. Two GOP colleagues he interacted with - Utah Sens. Mitt Romney and Mike Lee, also self-quarantined.

Meanwhile, GOP Sens. Rick Scott (FL) and Cory Gardner (CO) previously announced self-quarantines unrelated to Paul's announcement.

Senate Minority Leader Charles Schumer (D-N.Y.) said the bill includes "problematic" provisions and that McConnell should have made the negotiations include both chambers and the White House from the beginning. 

"Unfortunately, the legislation has not improved enough in the past three hours," he said.