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The group said it investing more than $1 million in two attack ads aimed at Trump, the Republican front-runner for president.
The first hit Trump for his past support for Democrats and left-leaning policies, before blasting him as "just another politician."
"Trump wants us to think he's mister tell-it-like-it-is. But he has a record. And it's very liberal. He's really just playing us for chumps," the ad's narrator says.
The second attack ad bashed Trump for supporting "eminent-domain abuse," or the supposedly inappropriate seizure of private land for a public purpose.
"Trump: the worst kind of politician," the narrator concludes.
Both lines of attack echo the themes outlined in a Tuesday report by Bloomberg
The Club for Growth, which frequently backs conservative candidates in Republican primaries, has often tangled with the Republican establishment. With Trump's rise, however, the group finds itself aligned with the establishment's opposition to the Republican front-runner.
For his part, Trump has repeatedly accused the Club for Growth of only attacking him because he refused to give the group $1 million.
View the two ads below.