FILE - In tis June 21, 2016, file photo, Senate Majority Leader Mitch McConnell of Ky., accompanied by, from left, Sen. John Barrasso, R-Wyo., Sen. John Thune, R-S.D., and Senate Majority Whip John Cornyn of Texas, listen to a question during a news conference on Capitol Hill in Washington. Democrats opened a last-minute push Tuesday, Sept. 27, for new talks on must-do legislation to prevent the government from shutting down this weekend, fight the Zika virus and help flood-ravaged Louisiana rebuild. The aim is to see if Republicans will relent and add money to help Flint, Mich., with its water crisis — and get Capitol Hill off a collision course that could lead to a government shutdown this weekend. (AP Photo/Alex Brandon, File)

FILE - In tis June 21, 2016, file photo, Senate Majority Leader Mitch McConnell of Ky., accompanied by, from left, Sen. John Barrasso, R-Wyo., Sen. John Thune, R-S.D., and Senate Majority Whip John Cornyn of Texas, listen to a question during a news conference on Capitol Hill in Washington. Democrats opened a last-minute push Tuesday, Sept. 27, for new talks on must-do legislation to prevent the government from shutting down this weekend, fight the Zika virus and help flood-ravaged Louisiana rebuild. The aim is to see if Republicans will relent and add money to help Flint, Mich., with its water crisis — and get Capitol Hill off a collision course that could lead to a government shutdown this weekend. (AP Photo/Alex Brandon, File)

WASHINGTON (AP) — A must-do bill to prevent the government from shutting down this weekend and to fund the fight against the Zika virus is stalled in the Senate, held up by bipartisan opposition as the clock ticks toward a Friday deadline.

Democrats, demanding money so Flint, Michigan, can address its lead-contaminated water crisis, overwhelmingly opposed the measure is a Senate test vote Tuesday. So did a dozen of the Senate’s most conservative members.

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The 45-55 vote ties up the stopgap funding bill — for now at least. The GOP defections left Senate Majority Leader Mitch McConnell, R-Ky., short of a simple majority, much less the 60 votes needed to clear a filibuster hurdle. McConnell is looking for a way out of the legislative box canyon that doesn’t include capitulating on Flint, which GOP leaders fear would start a revolt among House tea party conservatives.

Instead, senior congressional leaders are scrambling for a compromise solution on the Flint water issue that would satisfy Democrats. The Senate has passed $220 million worth of aid to Flint and other cities grappling with lead-tainted water and want the package added to the temporary spending bill.

Republican leaders are promising to address the Flint issue after the election in endgame talks on a separate water resources bill, but Democrats refuse to take them at their word.

″‘Trust me, we will consider Flint later’ — that’s like nothing to me,” said House Minority Leader Nancy Pelosi, D-Calif.

But House Majority Leader Kevin McCarthy, R-Calif., said talks continued. “There might be an element (on Flint) we could do,” McCarthy told reporters.

Democrats say it’s unfair that the water crisis in Flint has gone on for more than a year with no assistance, while Louisiana and other states are getting $500 million for floods that occurred just last month. Democrats have played a strong hand in the negotiations and know they have leverage because Republicans controlling the House and Senate are eager to avoid a politically harmful shutdown at midnight Friday.

“Democrats have been clear that Congress should not leave Flint and other lead-tainted communities out of any (stopgap spending) negotiation that includes emergency disaster funding,” said Senate Minority Leader Harry Reid, D-Nev., and other top Democrats in a Tuesday morning letter to McConnell.

McConnell characterized the Democratic position as “no Flint, no flood” and indicated he is considering dropping the flood aid. Both sides hope to avert that.

The stopgap spending bill would keep the government running through Dec. 9 and provide $1.1 billion in long-delayed funding to fight the spread of the Zika virus and develop a vaccine and improved tests to detect it. Zika can cause can cause grave birth defects.

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McConnell has made numerous concessions in weeks of negotiations on the measure, agreeing, for instance, to drop contentious provisions tied to Zika funding that led Democrats to filibuster prior Zika measures this summer and earlier this month. A provision to make Planned Parenthood ineligible for new anti-Zika funding for Puerto Rico was dropped, as was a provision to ease pesticide regulations under the Clean Water Act. A $400 million package of spending cuts added to the measure is no longer controversial.

The measure also includes a popular full-year spending bill that provides a 4 percent budget increase for the Department of Veterans Affairs.

“Can it really be that Democratic leaders have embraced dysfunction so thoroughly that they’d tank a noncontroversial, 10-week funding bill over — well, what exactly?” McConnell asked, as he opened the Senate on Tuesday. “It’s almost as if a few Democratic leaders decided long ago that bringing our country to the brink would make for good election-year politics.”

Republicans say the Flint issue will be handled in a separate measure to authorize water development projects. House floor debate began Tuesday on that measure — without Flint money — but Republicans are telegraphing it will be included in any final measure handled in a postelection session. But GOP leaders on Monday night blocked Rep. Dan Kildee, D-Mich. — who represents Flint — from getting a vote on the Senate measure.

Kildee noted that Flint is a predominantly African-American city and that other areas of the country are often quick to win help when disaster strikes.

“There’s something about this poor community — this poor, majority-minority community — that exempts them from the kind of help that we have provided time and time again to people in crisis in this country,” said Kildee, who is white. “I hate to come to the conclusion that there’s something about these people that causes this Congress to decide they don’t deserve that help. That is a shame.”

House Speaker Paul Ryan, R-Wis., said Tuesday that the water development bill “is the better place to address this.”

The White House, which has not transmitted an official request for Flint aid, poked at Ryan for excluding it from the water projects bill.

“The speaker of the House says he opposes adding funding for Flint to the continuing resolution and believes that it should be handled in the water resources bill. But it’s not included in the water resources bill that’s advancing through the House. And then he has the nerve to suggest that it’s Democrats who are the ones causing problems,” said White House Press Secretary Josh Earnest.