Former Trump rival Nikki Haley defended her decision to throw her support behind the GOP nominee Donald trump after Liz Cheney called her principles into question.

Cheney, a one-time rising Republican Party star who became a top GOP critic of former President Trump, endorsed Vice President Kamala Harris last week. She then called out Haley on ABC Sunday for saying she’s “on standby” to campaign for the GOP nominee.

“I respect [Cheney’s] decision, but she can’t say my decision is not principled,” Haley told “Fox & Friends” in response, Monday. “It actually is.”

“We can either vote based on style or we can vote on substance. I’m voting based on substance. I’m looking at the fact we can’t live the next four years like we did the last four years. This is no contest. Harris raised taxes. Trump reduced taxes. Harris wants to stop any energy production. Trump built it up. Harris is weak on national security. Trump was strong on national security. Harris has allowed the border to be infiltrated by 8 million people. Trump was much harder on the border.”