WASHINGTON — A divided House voted Thursday to prevent a government shutdown after an eleventh-hour deal brought conservatives aboard. But the GOP-written measure faced gloomy prospects in the Senate, and it remained unclear whether lawmakers would be able to find a way to keep federal offices open past a Friday night deadline.

The House voted by a near party-line 230-197 vote to approve the legislation, which would keep agency doors open and hundreds of thousands of federal employees at work through Feb. 16. The measure is designed to give White House and congressional bargainers more time to work through disputes on immigration and the budget that they’ve tangled over for months.

House passage was assured after the House Freedom Caucus reached an accord with House Speaker Paul Ryan, R-Wis. The leader of the hard-right group, Rep. Mark Meadows, R-N.C., said Ryan promised future votes on extra defense spending and on a conservative, restrictive immigration bill. Meadows also spoke to President Donald Trump.

But most Senate Democrats and some Republicans were expected to oppose the measure when it reached that chamber later Thursday. Democrats were hoping to spur slow-moving immigration talks, while a handful of Republicans, including Sen. Lindsey Graham, R-S.C., were pressing for swifter action on immigration and a long-sought boost in Pentagon spending.

Senate rejection would leave the pathway ahead uncertain with only one guarantee: finger-pointing by both parties.

The GOP controls the Senate 51-49 and will need a substantial number of Democratic votes to reach 60 — the number needed to end Democratic delaying tactics. Republicans were all but daring Democrats to scuttle the bill and force a shutdown because of immigration, which they said would hurt Democratic senators seeking re-election in 10 states that Trump carried in 2016.

“If there’s a government shutdown — and let’s hope there’s not — it’d be the Democrats shutting it down,” said Sen. Richard Shelby, R-Ala.

Democrats said voters would fault Republicans because they control Congress and the White House and because Trump shot down a proposed bipartisan deal among a handful of senators that would have resolved the conflict over how to protect hundreds of thousands of young immigrants from deportation.

“You have the leverage. Get this done,” House Minority Leader Nancy Pelosi of California said about Republicans.

Trump himself weighed in from Pennsylvania, where he flew to help a GOP candidate in a special congressional election.

“I really believe the Democrats want a shutdown to get off the subject of the tax cuts because they’re doing so well,” he said.

If the measure stalls in the Senate, the next steps were murky.

Barring a last-minute pact between the two parties on spending and immigration disputes that have raged for months, lawmakers said a measure financing agencies for just several days was possible to build pressure on negotiators to craft a deal.

Also imaginable: lawmakers working over the weekend with a shutdown under way — watched by a public that has demonstrated it has abhorred such standoffs in the past.