WASHINGTON -- House GOP leaders on Friday abruptly canceled a vote on a bill to update the George W. Bush-era No Child Left Behind education law after struggling to find support from conservatives.

The bill would keep the annual testing requirements on schools but would give more freedom to states and districts to spend federal dollars and identify and fix failing schools.

Conservative opponents said it doesn't go far enough to let states and districts set education policy. Groups such as Heritage Action for America and the Club for Growth are among the opponents.

"We have a constitutional duty as members of Congress to return education decisions to parents and states," Rep. Justin Amash, R-Mich., wrote this week on Facebook.

Democrats also dislike the bill and said it would abdicate the federal government's responsibility to ensure that poor, minority-group, disabled and non-English-speaking students go to good schools and that billions of federal education dollars are spent wisely.

The White House threatened to veto the bill, calling it "a significant step backwards."

Senior Republican officials said it was unclear when a vote would occur.

The officials spoke on condition of anonymity because they weren't authorized to publicly discuss private negotiations.

"I look forward to continuing to discuss with my colleagues the conservative reforms in this legislation, and I expect we will have an opportunity to finish this important work soon," Rep. John Kline, R-Minn., the sponsor of the bill, said in a statement.

Kline, chairman of the House Education and the Workforce Committee, said the delay happened because the debate over funding the Homeland Security Department had taken priority on the House floor.

The bipartisan 2002 No Child Left Behind law was a signature achievement of Bush, and its authors included the late Sen. Edward Kennedy, D-Mass., and current House Speaker John Boehner, R-Ohio.

It sought to close significant gaps in the achievement of poor and minority-group students and their more affluent peers.

The law mandated annual testing in reading and math for students in grades three to eight and again in high school.

Schools had to show student growth or face consequences.

But its requirement that all students be able to read and do math at grade level by 2014 proved elusive.

President Barack Obama's administration in 2012 began allowing waivers around some of the law's more stringent requirements if schools agreed to certain conditions, like using college- and career-ready standards such as Common Core.

Those standards have been adopted in more than 40 states and spell out what English and math skills students should master in each grade.

They are a political issue in many states because they are viewed by critics as a federal effort even though they were developed by U.S. governors.

House Republican leaders have used their bill to show their opposition to the Obama administration's encouragement of the Common Core state standards because it prohibits the federal education secretary from demanding changes to state standards or imposing conditions on states in exchange for a waiver around federal law.

It also eliminates many federal programs, creates a single local grant program and allows public money to follow low-income children to different public schools.

Dan Holler, a spokesman for Heritage Action for America, said conservatives were upset that amendments weren't allowed on provisions their group supported that included eliminating federal testing mandates, allowing states to opt out of the law and allowing public money to follow low-income students to private schools.

Maryland Rep. Steny Hoyer, the No. 2 House Democrat, noted that the same bill that was pulled from the floor Friday got no Democratic votes when it was passed by the House in 2013.

"How sad that, in an issue so important to our country, that we don't have a bipartisan bill," Hoyer said.

In the Senate, Sens. Lamar Alexander, R-Tenn., the chairman of the chamber's Committee on Health, Education, Labor and Pensions, and Patty Murray, D-Wash., the committee's senior Democrat, said they are working on a bipartisan proposal to fix the law.

Alexander said this week that he's hopeful he can get something to the Senate floor in March.

A Section on 02/28/2015