Over the weekend, GOP lawmakers already began to experience fallout in response to their vote, with constituents and progressive groups mobilizing at town halls and donating money to support the campaigns of their Democratic opponents.

Now, they are facing the first of likely many campaign ads that highlight the consequences of the repeal bill’s most dangerous provisions. The ads implore constituents to hold their representatives’ feet to the fire.

The health care advocacy group Save My Care on Monday unveiled a more than half-a-million-dollar television and digital ad campaign targeting 24 vulnerable GOP House members who voted for the “disastrous” bill, asking: “How could you do this to us?”

Watch an example of the ad above.

Similar versions will run in other districts this week.

The full list of targeted GOP representatives and their congressional districts:

Don Young (AK-01)

Martha McSally (AZ-02)

Jeff Denham (CA-10)

David Valadao (CA-21)

Steve Knight (CA-25)

Mimi Walters (CA-45)

Darrell Issa (CA-49)

Brian Mast (FL-18)

Carlos Curbelo (FL-26)

David Young (IA-03)

Peter Roskam (IL-06)

Bruce Poliquin (ME-02)

Tim Walberg (MI-07)

Jason Lewis (MN-02)

Erik Paulsen (MN-03)

Don Bacon (NE-02)

Tom MacArthur (NJ-03)

Mark Amodei (NV-02)

Lee Zeldin (NY-01)

John Faso (NY-19)

Elise Stefanik (NY-21)

Pete Sessions (TX-32)

Scott Taylor (VA-02)

David Brat (VA-07)