Presidential contender Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE slammed South Carolina Gov. Nikki Haley as weak on immigration at a rally in Sumter, S.C., on Wednesday.

When Trump mentioned Haley’s name, his supporters booed their home-state governor just hours after she threw her support behind rival Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE’s campaign.

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“Nikki Haley gave a speech a couple weeks ago,” Trump said, stopping as the crowd jeered.

“Yeah it’s not good,” he said. “It’s not good. First of all, she’s very weak on illegal immigration. Very weak. Very, very weak. She’s very weak on illegal immigration. You can’t have that. We need strong, strong immigration policies.”

In January, Haley warned in her State of the Union rebuttal that Republicans must not follow the “angriest voices” in the party. Haley later admitted she was referring to Trump.

The party front-runner has since incorporated that flap into his stump speech, saying that she’s right about him being angry and that he won’t apologize for it.

“I am angry, I’ll be honest,” Trump said Wednesday. “And so are the people that follow me, because we have the most loyal people and the people that follow Trump are angry. They’re angry.”

“Remember this — we’re not angry people,” he continued. “But you get upset and you get angry when you see such gross stupidity and incompetence."