WASHINGTON (AP) — The Republican-led House resoundingly rejected a far-ranging immigration bill on Wednesday despite an eleventh-hour endorsement by President Donald Trump, as the gulf between the GOP's moderate and conservative wings proved too deep for leaders to avert an election-year display of division.

The bill was killed 301-121, with nearly half of Republicans opposing the measure. The depth of GOP opposition was an embarrassing showing for Trump and a rebuff of House leaders, who'd postponed the vote twice and proposed changes in hopes of driving up the tally for a measure that seemed doomed from the start.

The roll call seemed to empower GOP conservatives on the fraught issue. Last week a harder-right package was defeated but 193 Republicans voted for it, 72 more than Wednesday's total. Another 112 Republicans voted "no."

"We need to start securing the border and not reward bad behavior, and that's what this bill did," said Rep. Roger Williams, R-Texas. Conservatives have opposed the bill's provision offering a chance at citizenship for hundreds of thousands of immigrants who came to the U.S. illegally as children, and have said it doesn't do enough to limit the relatives who immigrants here legally can sponsor for residence.

Even if it passed, the House bill rejected Wednesday would have been dead on arrival in the closely divided Senate, where Democrats would have had enough votes to kill it. House Democrats voted unanimously against it.

"Show some compassion," said Rep. Adriano Espaillat, D-N.Y., who came to the U.S. from the Dominican Republic with his parents at age 9. "Will we step up to be the country that allowed me, as a young boy, to find safety with my mother and father?"

GOP leaders have been talking about a Plan B: a bill focused narrowly on barring the government from wresting children from migrant families caught entering the country without authorization. With television and social media awash with images and wails of young children torn from parents, many Republicans have wanted to pass a narrower measure addressing those separations before Congress leaves at week's end for its July 4 break.

But that seemed unlikely. GOP aides said Republicans had yet to agree on bill language, and the effort was complicated by a federal judge who ordered that divided families be reunited with 30 days. Republicans have been working on legislation that would keep migrant families together by lifting a court-ordered 20-day limit on how long families can be detained.

Rep. Cathy McMorris Rodgers, R-Wash., a member of the GOP leadership, said she will work with the administration and lawmakers on "a solution that addresses the problem in the most practical and appropriate manner, especially in light of yesterday's court decision."

Besides creating a pathway to citizenship for some young immigrants, the defeated bill would provide $25 billion for Trump to build his coveted wall on the border with Mexico. It would restrict family-based immigration and bar the Homeland Security Department from taking migrant children from parents seized crossing into the country without authorization.

In a startling turnabout earlier Wednesday, Trump made an all-caps pitch for the bill. Last Friday, he'd urged Republicans to stop wasting time on the effort until after the November elections.

In his latest display of whiplash on the issue, Trump tweeted, "HOUSE REPUBLICANS SHOULD PASS THE STRONG BUT FAIR IMMIGRATION BILL, KNOWN AS GOODLATTE II, IN THEIR AFTERNOON VOTE TODAY, EVEN THOUGH THE DEMS WON'T LET IT PASS IN THE SENATE."

The tweet — which referenced Rep. Bob Goodlatte, R-Va., one of the bill's sponsors — was the latest example of Trump's erratic dealings with Congress. On Friday he dashed off a tweet, saying Republicans should "stop wasting their time on Immigration until after we elect more Senators and Congressmen/women in November."

The White House also sent a letter to lawmakers Wednesday formally stating its support, saying the legislation would "support the administration's goals" on immigration.

The vote caps months of futile GOP efforts to pass wide-ranging legislation on an issue that could color scores of congressional races in this fall's contest for House and perhaps Senate control. The Senate rejected three proposals in February, including one reflecting Trump's hard-line policies and two bipartisan plans.