The Obama administration is pressing GOP leaders to devote more funding to the fight against addiction before Congress sends its major opioids bill to the president’s desk this summer.

The head of the White House’s drug policy office, Michael Botticelli, joined Management and Budget Director Shaun Donovan Shaun L. S. DonovanHouse Dems call on OMB to analyze Senate budget plan Overnight Finance: Dems turn up heat on Wells Fargo | New rules for prepaid cards | Justices dig into insider trading law GOP reps warn Obama against quickly finalizing tax rules MORE in a call to action Friday to approve a fully funded opioids bill — an approach that was backed by a majority of senators on the floor this week.

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“Congress has been voting on various pieces of legislation related to the opioid epidemic, but so far has not provided the resources needed to make treatment available to everyone who wants it,” Botticelli and Donovan wrote in a blog post published Friday afternoon.

The message from the White House came one day after the Senate voted to begin talks with the House to merge the two, mostly bipartisan opioid bills.

The same day, a majority of the Senate, 66 lawmakers, voted to support an earlier version of the bill that included funding. That move helps ensure that the issue of funding remains part of negotiations even though most of the Republicans appointed to the conference committee don’t agree with it.

Among the five Senate Republicans put on the committee, three — including the No. 2-ranking senator, John Cornyn John CornynCalls grow for Biden to expand election map in final sprint Bipartisan praise pours in after Ginsburg's death Chamber of Commerce endorses McSally for reelection MORE (Texas) — said they’d oppose funding in the bill.

From the start, Democrats — as well as some vulnerable GOP senators such as Rob Portman Robert (Rob) Jones PortmanRomney undecided on authorizing subpoenas for GOP Obama-era probes Congress needs to prioritize government digital service delivery House passes B bill to boost Postal Service MORE (Ohio) — have demanded more funding to help local health officials deal with a mounting death toll from opioid overdoses.

Most Republicans, however, have argued that more money wouldn’t solve the problem until more is known about how best to fight the epidemic. Several pieces of the GOP bills call for more studies into “best practices” nationwide.

House and Senate GOP leaders have touted their efforts on opioids as a top priority ahead of the fall general election, though the intraparty spat over funding has stalled the bills for months.

Several vulnerable GOP lawmakers joined the Democrats in calling for funding, including Sens. Portman, Mark Kirk Mark Steven KirkLiberal veterans group urges Biden to name Duckworth VP On the Trail: Senate GOP hopefuls tie themselves to Trump Biden campaign releases video to explain 'what really happened in Ukraine' MORE (Ill.), Pat Toomey (Pa.) and Kelly Ayotte Kelly Ann AyotteBottom line Bottom line Bottom Line MORE (N.H.).

The list also included several Republicans from states hit harder by the opioid crisis, such as Iowa, West Virginia, Tennessee and Georgia.

The five Republicans on the committee are Chuck Grassley Charles (Chuck) Ernest GrassleySenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE (Iowa), Lamar Alexander Andrew (Lamar) Lamar AlexanderToobin: McConnell engaging in 'greatest act of hypocrisy in American political history' with Ginsburg replacement vote Chamber of Commerce endorses McSally for reelection Trump health officials grilled over reports of politics in COVID-19 response MORE (Tenn.), Orrin Hatch Orrin Grant HatchBottom line Bottom line Senate GOP divided over whether they'd fill Supreme Court vacancy MORE (Utah), and Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE (Ala.).

The Democrats are Sen. Patrick Leahy Patrick Joseph LeahyBattle over timing complicates Democratic shutdown strategy Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (Vt.), Patty Murray Patricia (Patty) Lynn MurrayTrump health officials grilled over reports of politics in COVID-19 response CDC director pushes back on Caputo claim of 'resistance unit' at agency The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (Wash.) and Ron Wyden Ronald (Ron) Lee WydenGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high Republican Senators raise concerns over Oracle-TikTok deal Hillicon Valley: TikTok, Oracle seek Trump's approval as clock winds down | Hackers arrested for allegedly defacing U.S. websites after death of Iranian general | 400K people register to vote on Snapchat MORE (Ore.).

Senate Democratic leaders say they already have proof that opioid funding is a bipartisan issue.

Murray has called attention to her recent efforts with Sen. Roy Blunt Roy Dean BluntCDC tells Congress it urgently needs billion for vaccine distribution On The Money: Trump undercuts GOP, calls for bigger COVID-19 relief package | Communities of color hit hardest financially by COVID-19 | Businesses, states pass on Trump payroll tax deferral Trump undercuts GOP, calls for bigger COVID-19 relief package MORE (R-Mo.) on the health subpanel of the Senate Appropriations Committee to approve the first bipartisan spending bill in seven years. That bill included a $126 million increase in opioids-related programs over last year's total.

Democrats have called for at least $600 million in emergency funding to halt the epidemic.

Deaths from opioid drug overdoses hit an all-time record in the U.S. last year, rising 14 percent.