technically Pelosi lit the fuse when she forced a whole set of pot subsidies into the bill to enable her constituents (dispensaries owned by big corps) to qualify for all that free money. When this Cares 2.0 was passed McConnell was quoted that while he didn't want to keep the unemployment benefits, he was going to kill it due to the pot benefits contained. Pelosi, I believe, has a lot of investment in the medical companies that control most Cali dispensaries and manufacturing for marijuana. The republicans were never going to approve it with the pot pork it contained, and so it was always going to need to go back to the house where she may have fucked with it more.