A number of prominent Republicans are vowing to never back Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE even as he closes in on the GOP presidential nomination.

The "Never Trump" ranks include lawmakers, party operatives, pundits and GOP donors — and the movement even sparked a popular hashtag on social media.

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They are convinced Trump as standard-bearer would lead the GOP to a devastating defeat in November, costing the party the Senate and potentially the House.

But there are also growing signs many in the GOP establishment are warming to the presumptive nominee. Trump's been endorsed by 14 lawmakers, with others regularly attending Capitol Hill meetings with his staff.

Republican National Committee (RNC) Chairman Reince Priebus has criticized the Never Trump movement as well. "It is essential to victory in November that we all support our candidate," Priebus said at the RNC's spring meeting.

Here's a list of prominent Republicans who won't vote for Trump.

Last updated on Aug. 3 at 10:30 a.m.

Rep. Justin Amash Justin AmashOn The Trail: How Nancy Pelosi could improbably become president History is on Edward Snowden's side: Now it's time to give him a full pardon Trump says he's considering Snowden pardon MORE (Mich.)

Gov. Charlie Baker (Mass.)

Brian Bartlett, former Mitt Romney aide and GOP communications strategist

Glenn Beck, radio host

Michael Berry, radio host

Max Boot, former foreign policy adviser to Sen. Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE (R-Fla.)

Brent Bozell, conservative activist

Former Gov. Jeb Bush (Fla.)

Bruce Carroll, creator GayPatriot.org

Jay Caruso, RedState

Mona Charen, senior fellow at Ethics and Public Policy Center

Linda Chavez, columnist

Dean Clancy, former FreedomWorks vice president

Eliot Cohen, former George W. Bush official

Former Sen. Norm Coleman (Minn.)

Charles C. W. Cooke, writer for National Review

Doug Coon, Stay Right podcast

Rory Cooper, GOP strategist, managing director Purple Strategies

Jim Cunneen, former Calif. assemblyman

Rep. Carlos Curbelo (Fla.)

Steve Deace, radio host

Rep. Bob Dold (Ill.)

Ross Douthat, New York Times columnist

Erick Erickson, writer

Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeRepublican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style Bush endorsing Biden? Don't hold your breath MORE (Ariz.)

Mindy Finn, president, Empowered Women

Daniel Foster, contributing editor National Review Online

David French, writer at National Review

Jon Gabriel, editor-in-chief, Ricochet.com

Sen. Lindsey Graham Lindsey Olin GrahamSenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (S.C.)

Michael Graham, radio host

Jonah Goldberg, writer

Alan Goldsmith, former staffer, House Committee on Foreign Affairs.

Stephen Gutowski, writer Washington Free Beacon

Rep. Richard Hanna (N.Y.)

Jamie Brown Hantman, former special assistant for legislative affairs for President George W. Bush

Stephen Hayes, senior writer at The Weekly Standard

Doug Heye, former RNC communications director

Quin Hillyer, contributing editor at National Review Online; senior editor at the American Spectator

Gov. Larry Hogan (Md.)

Ben Howe, RedState writer

Former Rep. Bob Inglis (S.C.)

Cheri Jacobus, GOP consultant and former Hill columnist

Robert Kagan, former Reagan official

Randy Kendrick, GOP donor

Matt Kibbe, former FreedomWorks CEO

Rep. Adam Kinzinger (R-Ill.)

Sen. 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 (R-Ill.)

Philip Klein, managing editor at the Washington Examiner

Bill Kristol, The Weekly Standard editor

Frank Lavin, former Reagan aide

Mark Levin, radio host

Justin LoFranco, former Scott Walker aide

Kevin Madden, former Mitt Romney aide

Bethany Mandel, senior contributor at The Federalist

Tucker Martin, former Gov. Bob McDonnell's (R-Va.) communications director

Former RNC Chairman Mel Martínez (Fla.)

Liz Mair, GOP strategist

Lachlan Markey, writer for the Free Beacon

David McIntosh, Club for Growth president

Dan McLaughlin, editor at RedState.com

Ken Mehlman, former RNC chairman

Tim Miller, Our Principles PAC

Joyce Mulliken, former Washington state senator

Ted Newton, political consultant & former Mitt Romney aide

James Nuzzo, former White House aide

Katie Packer, chairwoman of Our Principles PAC

Former Gov. George Pataki (N.Y.)

Former Rep. Ron Paul (Texas)

Katie Pavlich, Townhall editor and Hill columnist

Art Pope, GOP donor

Brittany Pounders, conservative writer

Tomás Regalado, Mayor of Miami

Rep. Reid Ribble Reid James RibbleFormer Sen. Tom Coburn dies at 72 Ex-GOP lawmakers side with NY in Supreme Court case over Trump tax returns Former GOP lawmakers, officials ask court to enforce House subpoena on McGahn MORE (Wis.)

Marlene Ricketts, GOP donor

Former Gov. Tom Ridge (Pa.)

Rep. Scott Rigell Edward (Scott) Scott RigellEx-Rep. Scott Taylor to seek old Virginia seat GOP rushes to embrace Trump GOP lawmaker appears in Gary Johnson ad MORE (Va.)

Mitt Romney, 2012 GOP presidential nominee

Rep. Ileana Ros-Lehtinen (Fla.)

Paul Rosenzweig, former deputy assistant secretary, Department of Homeland Security

Jennifer Rubin, Washington Post conservative blogger

Patrick Ruffini, partner, Echelon Insights

Sarah Rumpf, former BreitBart contributor

Mark Salter, writer and former aide to John McCain John Sidney McCainMcSally says current Senate should vote on Trump nominee Say what you will about the presidential candidates, as long as it isn't 'They're too old' The electoral reality that the media ignores MORE

Rep. Mark Sanford (S.C.)

Sen. Ben Sasse (Neb.)

Elliott Schwartz, Our Principles PAC

Gabriel Schoenfeld, senior fellow, Hudson Institute

Tara Setmayer, CNN analyst and former GOP staffer

Ben Shapiro, editor-in-chief The Daily Wire

Evan Siegfried, GOP strategist and commentator

Ben Stein, actor and political commentator

Brendan Steinhauser, GOP consultant

Stuart Stevens, former Romney strategist

Paul Singer, GOP donor

Erik Soderstrom, former field director for Carly Fiorina

Charlie Sykes, radio host

Brad Thor, writer

Michael R. Treiser, former Mitt Romney aide

Daniel P. Vajdich, former national security adviser to Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE

Connor Walsh, former digital director for former Rep. Eric Cantor Eric Ivan CantorThe Hill's Campaign Report: Florida hangs in the balance Eric Cantor teams up with former rival Dave Brat in supporting GOP candidate in former district Bottom line MORE (R-Va.), founder Build Digital

Former Rep. J.C. Watts (Okla.)

Peter Wehner, New York Times contributor

Former Gov. Christine Todd Whitman (N.J.)

Meg Whitman, president and CEO of Hewlett-Packard

George Will, writer

Rick Wilson, Republican strategist

Nathan Wurtzel, Make America Awesome super-PAC

Bill Yarbrough, chairman of the Republican Liberty Caucus of Ohio

Dave Yost, Ohio auditor of state

An earlier version incorrectly included Dana Loesch.

Please send updates to mmali@thehill.com.