Schumer just spoke to Congress
Said he felt the Republican proposal was done without bipartisan support and that the Democrats are "unified" on wanting a "clean CR" through April 11th to negotiate on a federal budget.
Earlier reporting had Schumer as one of the Dems considered on the fence about voting for the Rep CR proposal (due to the perceived negative optics of a shutdown) so this may signal a changing current.
The current expectation was the Republican proposal may pass (funding through September) by a narrow margin. This is the biggest sign so far from a major Senate Dem that they're not going to go for that.