WASHINGTON — The Senate’s top Republican on Thursday unveiled legislation to prevent a government shutdown next weekend and provide more than $1 billion to battle the Zika virus. It also would provide $500 million to help Louisiana rebuild from last month’s devastating floods.

Majority Leader Mitch McConnell said the stopgap measure was “clean” of controversies and he left out internet-related language demanded by Texas Sen. Ted Cruz and Republican presidential nominee Donald Trump.

But Democrats immediately blasted the proposal for failing to fund one of their top priorities: money to help Flint, Michigan, repair its lead-tainted water system.

McConnell’s move could set up a showdown vote next week. Democrats said they will likely filibuster the measure because it omits a bipartisan plan to provide $220 million to help Flint and other cities with lead emergencies replace pipes and take other steps to clean their water.

“To see the (stopgap funding bill) come to the floor with help for Louisiana and not for the families of Flint is outrageous,” said Democratic Sen. Debbie Stabenow of Michigan. “And I will do everything in my power to make sure that this does not happen.” She noted that the Flint aid has been many months in the making and is financed by spending cuts, while funding for flood aid in Louisiana is added directly to the national debt.

McConnell said the measure is “the result of many, many hours of bipartisan work across the aisle,” noting that it would also allow stepped-up spending to combat opioid abuse – a priority of several Senate Republicans who are up for re-election, such as Kelly Ayotte of New Hampshire and Rob Portman of Ohio.