The three conservative Democratic lawmakers threatening to kill their party’s drug pricing legislation have raked in roughly $1.6m of campaign cash from donors in the pharmaceutical and health products industries. One of the lawmakers is the House’s single largest recipient of pharmaceutical industry campaign cash this election cycle, and another lawmaker’s immediate past chief of staff is now lobbying for drugmakers.

The threat from Democratic representatives Kurt Schrader (Oregon), Scott Peters (California) and Kathleen Rice (New York) comes just as the pharmaceutical industry’s top lobbying group announced a seven-figure ad campaign to vilify the Democratic legislation, which aims to lower the cost of medicines for Americans now facing the world’s highest prescription drug prices.

At issue is House Democrats’ initiative to let Medicare use its bulk purchasing power to negotiate lower prescription drug prices. That power – which is used by other industrialized countries to protect their citizens from exorbitant prices – has been promised by Democrats for years, and party leaders have been planning to include it as part of their sprawling $3.5tn infrastructure reconciliation effort.

On Wednesday, Schrader, Peters and Rice helped vote the measure down in the powerful energy and commerce committee, blocking the legislation before it could come to the House floor for a vote. Even if the bill were to ultimately make it to the floor through another committee – which remains a possibility – Democrats have only a four-seat majority that allows them to pass legislation, so they can’t afford to lose any more votes.

“I understand that the pharmaceutical industry owns the Republican party and that no Republican voted for this bill, but there is no excuse for every Democrat not supporting it,” said the Vermont Senator Bernie Sanders after the vote.

The trio of Big Pharma Democrats are jeopardizing a plan based on HR 3, the Elijah E Cummings Lower Drug Costs Now Act. The Congressional Budget Office has said the drug pricing legislation, named for the late Representative Elijah Cummings of Maryland, would save the government $456bn and “reduce prices by 57% to 75%, relative to current prices” for various medicines.

The measure would direct federal health regulators to negotiate prices of 25 high-priced drugs in the first year of implementation and 50 drugs in subsequent years, and the new negotiated prices would be available to both Medicare and private insurers.

Polls show that the idea of allowing Medicare to negotiate drug prices is wildly popular – to the point where swing-state Republicans and swing-district Democrats, and even former President Donald Trump, have expressed support for it.

Schrader and Peters are among the two biggest recent Democratic recipients of pharmaceutical industry donations, according to OpenSecrets. The pharmaceutical and health products industries are collectively the second biggest donor to both lawmakers over the course of their careers, giving them almost $1.5m in total. Peters is the House’s top recipient of pharmaceutical industry donations in the 2022 election cycle.

Peters and his family were worth an estimated $60m in 2018, making him one of the wealthiest lawmakers in Congress, according to OpenSecrets. His wife is the president and CEO of Cameron Holdings, an investment firm whose portfolio company provides manufacturing and packaging for pharmaceutical companies.

Schrader’s net worth, meanwhile, was pegged at nearly $8m. The Oregonian reported in 2008 that he received “a quite large inheritance” from his grandfather, who was “vice president and director of biochemical research and development at Pfizer” – the drugmaker whose political action committee is now Schrader’s third largest career donor.

The congressmen on Tuesday offered their own drug pricing proposal, which would allow Medicare to negotiate prices only under limited conditions, such as when a company no longer has exclusive marketing rights on an older drug but there are no competitors. That proposal was also backed by the Democratic representative Stephanie Murphy (Florida), the co-chair of the conservative Blue Dog Coalition, who is the House’s fifth largest recipient of donations from the pharmaceutical and health products industries.

Earlier this year, Peters’ campaign saw a surge in donations from pharmaceutical company executives after he organized a letter with nine other Democratic lawmakers informing the House speaker, Nancy Pelosi, that they opposed HR 3. Schrader and Rice co-signed the letter.

It’s worth noting that Peters, Schrader and Rice all voted in favor of HR 3 in the previous Congress. Politico wrote in May that Peters “said he cast that vote knowing it had no chance of becoming law at the time. He said he supported it only to ‘start a conversation about lowering the cost of prescription drugs’.”

Rice, Schrader and Peters have seats on the House energy and commerce committee, which is writing the party’s prescription drug plan, and they used those positions to help block the measure there on Wednesday, preventing it from moving to the floor.

Last December, House Democrats’ steering committee voted to put Rice on the energy and commerce panel instead of the progressive New York representative Alexandria Ocasio-Cortez.

On Tuesday, Rice explained that she opposes the drug pricing measure because “I do not support advancing policies that are not fiscally responsible and jeopardize the bill’s final passage.”

Schrader’s longtime top aide, Paul Gage, left the congressman’s office earlier this year, according to Legistorm, and quickly started lobbying for Pharmaceutical Research and Manufacturers of America (PhRMA), the powerful Washington drug lobby.

Gage has been lobbying Congress on drug pricing issues and HR 3, according to ethics records. PhRMA raised more than $500m in 2019, and the organization is one of the top lobbying spenders in DC.

On Wednesday, PhRMA announced it is launching an ad campaign against House Democrats’ drug pricing efforts. “Politicians say they want to negotiate medicine prices in Medicare,” one ad warns. “But make no mistake: What politicians mean is they’ll decide which medicines you can and can’t get.”

The Blue Dog Coalition’s political action committee has been making monthly payments to a consulting firm led by the coalition’s former communications director, Kristen Hawn.

Hawn is also a partner at the bipartisan public affairs firm ROKK Solutions, which has worked for PhRMA.

• David Sirota is a Guardian US columnist and an award-winning investigative journalist. He is an editor-at-large at Jacobin, and the founder of the Daily Poster. He served as Bernie Sanders’ presidential campaign speechwriter

• Andrew Perez is a senior editor at the Daily Poster and a cofounder of the Democratic Policy Center

• This article was originally published in the Daily Poster, a grassroots-funded investigative news outlet