Spoiler: It's not going to happen
It leaked out today that Biden offered to trade his proposal for a corporate tax hike in exchange for a 15% floor on corporate taxes.
There's no word on how Republicans responded but now that he's put a lower number (or no change at all) on a proposal, it's going to be near-impossible to walk it back.
As for overall talks on the infrastructure bill, the White House said there is 'runway' left in talks and that they're keeping a range of pathways open. Previously the White House had said Memorial Day was the deadline.