AARP, the nation’s largest seniors group, is launching a seven-figure television advertisement buy asking Republican senators in key states to vote against the Obamacare repeal legislation the House of Representatives passed earlier this month.

The ads are due to begin this week in the home states of Sens. Jeff Flake (Ariz.), Cory Gardner (Colo.), Dean Heller (Nev.), Lisa Murkowski (Alaska) and Dan Sullivan (Alaska). AARP plans to spend at least six figures on the ads in each of the four states where they air.

The senators AARP is targeting are all either moderate, or ― in the cases of Flake and Heller ― up for re-election in 2018.

“Older Americans are very worried about the cost of their health insurance,” AARP executive vice president Nancy LeaMond said in a statement announcing the ad buy. “AARP is taking a strong stand against the American Health Care Act for one simple reason: it is a bad bill.”

AARP, which represents 38 million Americans age 50 or older, is “urging Senators to scrap the AHCA and start over,” LeaMond added.

AARP’s 30-second ad focuses on two of the House bill’s most controversial features: a waiver allowing states to opt out of federal regulations protecting people with pre-existing conditions, and an increase in the age rating that would allow people over 50 to be charged five times more than younger individuals. AARP has dubbed the latter provision an “age tax.” Obamacare, by contrast, allowed insurers to charge people over 50 a maximum of three times more than younger people.

In the ad, an older couple named the Hutchinses learns how much these aspects of the law will cost them during a visit with their accountant at an office not too subtly named Ryan and Associates Financial & Tax Services.

Mr. Hutchins has asthma, which the accountant tells him is a pre-existing condition. “Insurers can charge thousands more for that,” the accountant says. “This is going to be a big bill.”

Story continues

The ad concludes with a narrator telling viewers to call one of the five senators and tell them to vote “no on the health care bill.”

In a new AARP ad aimed at sinking the Republican Obamacare repeal bill, an accountant explains to an older couple how the bill would cost them. (Photo: AARP/YouTube)

Along with the advertising campaign, AARP is also asking its members to call their senators to voice their opposition to the House bill.

AARP played an important role in making the Republican health care bill that passed the House politically radioactive. It launched internet ads featuring a talking squirrel that denounced the bill’s provision permitting insurers to charge older Americans more.

The campaign AARP announced Wednesday, however, is the organization’s first foray into paid television advertising over the Obamacare replacement bill, suggesting the influential group is increasingly worried that the legislation has a chance of passing into law.

Hours after AARP announced the ad campaign, the nonpartisan Congressional Budget Office released an updated estimate of the Republican bill’s impact on health insurance coverage. The bill would result in 23 million fewer Americans having insurance, according to CBO.

Like most political advertisements, AARP’s video elides some policy nuances. The House health care bill partially offsets the 5-to-1 age rating with tax credits to buy insurance on the exchanges; those credits increase as customers age. But AARP has argued the credits are inadequate to defray the potential cost increase for older Americans, since the credits max out at twice as large as those younger individuals receive.

In addition, the law would allow states to opt out of Obamacare’s community rating regulations that obligate insurers to set premiums based on regional costs, rather than charge exorbitant amounts for pre-existing conditions. House Republicans tried to address these concerns by requiring states that waive these rules to set up high-risk pools to cover people with pre-existing conditions at rates they can afford. But conservative and liberal experts alike believe the funding in the bill is far too low to accommodate the cost of covering those people.

There are some early signs that AARP could get its wish that the Senate start from scratch. Almost immediately after the House passed its version of the law earlier this month, several Republican senators declared their intention to craft an entirely different law.

Also on HuffPost

Taking Security Seriously

Sen. Richard Blumenthal (D-Conn.) talks with Sen. Elizabeth Warren (D-Mass.) before the start of a Senate Armed Services Committee hearing concerning the roles and responsibilities for defending the nation against cyberattacks, on Oct. 19, 2017.

With Liberty And Justice...

Members of Code Pink for Peace protest before the start of a hearing where U.S. Attorney General Jeff Sessions will testify to the Senate Judiciary Committee in the Hart Senate Office Building on Capitol Hill on Oct. 18, 2017. Committee members questioned Sessions about conversations he had with President Donald Trump about the firing of former FBI Director James Comey, the Deferred Action for Childhood Arrivals (DACA) policy, the ongoing investigation about Russian interference in the 2016 presidential election and other subjects.

Whispers

Sen. Richard Burr (R-N.C.), right, speaks with Sen. Mark Warner (D-Va.) before a confirmation hearing for Christopher Sharpley, nominee for inspector general of the CIA, on Oct. 17, 2017.

Not Throwing Away His Shot

Lin-Manuel Miranda, creator of the musical "Hamilton," makes his way to a meeting of the House Appropriations Subcommittee on Interior, Environment and Related Agencies in the Rayburn Office Building during a round of meetings to urge federal funding for the arts and humanities on Sept. 13, 2017.

Medicare For All

Sen. Bernie Sanders (I-Vt.), center, speaks on health care as Sen. Richard Blumenthal (D-Conn.), left, and Sen. Kirsten Gillibrand (D-N.Y.), right, listen during an event to introduce the Medicare for All Act on Sept. 13, 2017.

Bernie Bros

Supporters of Sen. Bernie Sanders (I-Vt.) pack his office on Sept. 8, 2017. Members of the "Draft Bernie for a People's Party" campaign delivered a petition with more than 50,000 signatures to urge the senator to start and lead a new political party.

McCain Appearance

Sen. John McCain, second from left, leaves the Capitol after his first appearance since being diagnosed with cancer. He arrived to cast a vote to help Republican senators narrowly pass the motion to proceed for the replacement of the Affordable Care Act on July 25, 2017.

A Narrow Win

Senate Majority Leader Mitch McConnell, center, speaks alongside Sens. John Barrasso, left, John Cornyn, right, and John Thune, rear, after the Senate narrowly passed the motion to proceed for the replacement of the Affordable Care Act on July 25, 2017.

Kushner Questioning

Jared Kushner, White House senior adviser and son-in-law to President Donald Trump, arrives at the Capitol on July 25, 2017. Kushner was interviewed by the House Intelligence Committee in a closed-door meeting about contacts he had with Russia.

Hot Dogs On The Hill

Rep. Frank Lucas (R-Okla.) prepares a hot dog during the American Meat Institute's annual Hot Dog Lunch in the Rayburn Office Building courtyard on July 19, 2017.

And Their Veggie Counterparts

Rep. Jackie Speier (D-Calif.) visits the People for the Ethical Treatment of Animals veggie dog giveaway on July 19, 2017, countering a National Hot Dog Day event being held elsewhere on Capitol Hill.

Poised For Questions

Callista Gingrich, wife of former House Speaker Newt Gingrich, waits for a Senate Foreign Relations Committee hearing on her nomination to be the U.S. ambassador to the Vatican on July 18, 2017.

Speaking Up

Health care activists protest to stop the Republican health care bill at Hart Senate Office Building on Capitol Hill on July 17, 2017.

In The Fray

Sen. Ted Cruz (R-Texas) speaks to members of the media after announcing the revised version of the Senate Republican health care bill on Capitol Hill on July 13, 2017.

Anticipation

Christopher Wray is seated with his daughter Caroline, left, as he prepares to testify at a Senate Judiciary Committee confirmation hearing on his nomination to be the next FBI director on July 12, 2017.

Up In Arms

Health care activists protest to stop the Republican health care bill at Russell Senate Office Building on Capitol Hill on July 10, 2017.

Across A Table

Speaker of the House Paul Ryan (R-Wis.) meets with South Korean President Moon Jae-in on Capitol Hill on June 29, 2017.

Somber Day

House Minority Leader Nancy Pelosi (D-Calif.) speaks about the recent attack on the Republican congressional baseball team during her weekly press conference on Capitol Hill on June 15, 2017.

Family Matters

Rep. Joe Barton (R-Texas), right, and his sons, Jack, 10, and Brad, arrive in the basement of the Capitol after a shooting at the Republican baseball practice in Alexandria, Virginia, on June 14, 2017.

A Bipartisan Pause

Rep. Joe Barton (R-Texas), right, coach of the Republican congressional baseball team, tells the story of the shooting that occurred during a baseball practice while he stands alongside Rep. Mike Doyle (D-Pa.), left, a coach of the Democratic congressional baseball team on June 14, 2017.

Hats On

Rep. Chuck Fleischmann (R-Tenn.) reacts about the shooting he was present for at a Republican congressional baseball practice in Alexandria, Virginia, as he speaks with reporters at the U.S. Capitol in Washington on June 14, 2017.

Public Testimony

U.S. Attorney General Jeff Sessions is sworn in to testify before a Senate Intelligence Committee hearing on Capitol Hill on June 13, 2017.

Comey's Big Day

Former FBI Director James Comey testifies before a Senate Intelligence Committee hearing on Russia's alleged interference in the 2016 U.S. presidential election on Capitol Hill on June 8, 2017.

Conveying His Point

U.S. Director of National Intelligence Daniel Coats testifies at a Senate Intelligence Committee hearing on his interactions with the Trump White House and on the Foreign Intelligence Surveillance Act on June 7, 2017.

Selfie Time

Vice President Mike Pence takes a selfie with a tourist wearing a "Make America Great Again" hat inside the U.S. Capitol rotunda on June 6, 2017. The vice president walked through the rotunda after attending the Senate Republican policy luncheon.

Budget Queries

Office of Management and Budget Director Mick Mulvaney testifies before the House Budget Committee about President Donald Trump's fiscal 2018 budget proposal on Capitol Hill on May 24, 2017.

Flagged Down By Reporters

Sen. Richard Burr (R-N.C.), chairman of the Senate Intelligence Committee, leaves a closed committee meeting on Capitol Hill on May 24, 2017. The committee is investigating possible Russian interference in the U.S. presidential election.

Shock And Awe

House Minority Leader Nancy Pelosi (D-Calif.) and Sen. Bernie Sanders (I-Vt.) hold a news conference on the release of the president's fiscal 2018 budget proposal on Capitol Hill on May 23, 2017.

Seeing Double

Sen. Dianne Feinstein (D-Calif.) arrives in the Capitol for the Senate Democrats' policy lunch on May 16, 2017.

Honoring Officers

President Donald Trump speaks at the National Peace Officers Memorial Service on the West Lawn of the Capitol on May 15, 2017.

Whispers

Senate Intelligence Committee Chairman Richard Burr (R-N.C.), right, and ranking member Sen. Mark Warner (D-Va.) talk during a hearing with the heads of the U.S. intelligence agencies in the Hart Senate Office Building on Capitol Hill on May 11, 2017.

Skeptical

Former acting Attorney General Sally Yates arrives to testify before a Senate Judiciary Committee hearing on Russian interference in the 2016 U.S. election on Capitol Hill on May 8, 2017.

Differing Opinions

Rep. Glenn Grothman (R-Wis.) gives a thumbs-up to protesters on the East Front of the Capitol after the House passed the Republicans' bill to repeal and replace the Affordable Care Act on May 4, 2017. The protesters support the ACA.

Real Talk

United States Naval Academy Midshipman 2nd Class Shiela Craine (left), a sexual assault survivor, testifies before the House Armed Services Committee's Subcommittee on Military Personnel with (2nd from left to right) Ariana Bullard, Stephanie Gross and Annie Kendzior in the Rayburn House Office Building on Capitol Hill on May 2, 2017. Kendzior, a former midshipman, and Gross, a former cadet, were both raped twice during their time at the military academies. The academy superintendents were called to testify following the release of a survey last month by the Pentagon that said 12.2 percent of academy women and 1.7 percent of academy men reported experiencing unwanted sexual contact during the 2015-16 academic year.

In Support Of Immigrants

Congressional Hispanic Caucus Chair Rep. Michelle Lujan Grisham (D-N.M.), center, is joined by dozens of Democratic members of the House of Representatives to mark "Immigrant Rights Day" in the Capitol Visitor Center on May 1, 2017 in Washington, D.C. The Democratic legislators called on Republicans and President Donald Trump to join their push for comprehensive immigration reform.

Love HuffPost? Become a founding member of HuffPost Plus today.

This article originally appeared on HuffPost.