In a highly combative speech that sent her voice rising to hitherto unheard crescendos, Hillary Clinton on Thursday attacked Donald Trump’s foreign policy, saying he is reckless and “temperamentally unfit” to hold the presidency.

“This is not someone who should ever have the nuclear codes because it’s not hard to imagine Donald Trump leading us into a war.”

Looking past her potential California loss on Tuesday and her inability to put away a feeble Vermont senator in the primaries, Clinton targeted Trump throughout — often with incendiary rhetoric intended to stoke the hyper-liberal Democratic base of supporters assembled for her San Diego speech. Clinton repeatedly repeated what will become her mantra in the campaign: Trump is dangerous to America — and the world.

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“This is not someone who should ever have the nuclear codes because it’s not hard to imagine Donald Trump leading us into a war just because somebody got under his very thin skin,” said Clinton, who voted for America to go to war in Iraq. “Donald Trump’s ideas aren’t just different, they are dangerously incoherent. They’re not even really ideas — just a series of bizarre rants, personal feuds, and outright lies.”

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In the speech, read from a teleprompter, Hillary got personal, calling Trump “thin-skinned” and “quick to anger.” With red-meat lines peppered throughout for the partisan crowd, she belittled the presumptive GOP nominee, at one point saying “this isn’t reality television, this is actual reality,” mocking his starring role on NBC’s “The Apprentice.”

The former secretary of state touted her achievements, defending her widely panned actions. “I have sat in the situation room and advised the president on some of the toughest choices he faced, so I’m not new to this work and I’m proud to run on my record.”

But she did not exactly detail her supposedly stellar scorecard. Clinton has a long track record of foreign policy failures during her tenure as secretary of state — the failed Russian reset, the murder of the U.S. ambassador and three Americans in Benghazi, regime change in Libya and Syria — which played a role in the rise of Islamic extremism in the region — and how she helped drive Iran to the negotiating table for the disastrous Iran deal. Critics ripped her speech afterward.

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“Hillary will be Obama’s third term, on both domestic and foreign policy,” Ambassador John Bolton said. “Her attacks on Trump are primarily efforts to distract attention from her own failures.”

The Democrats are already adhering to crafted talking points: Trump is a danger. But Hillary went further, saying the GOP nominee would embarrass America if elected.

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“Making Donald Trump our commander-in-chief would be a historic mistake,” Clinton said. “It would fuel an ugly narrative of who we are — that we are fearful and not confident.”

Chinese and Russian leaders would, she said, “love” the U.S. to elect a president willing to withdraw from American commitments. “If Donald gets his way, they’ll be celebrating in the Kremlin,” Clinton said.

She defended Mexico, which allows a massive flow of illegals into the U.S. — and threw Canada in for good measure. “We’re lucky to have two friendly neighbors on our land borders. Why would he want to make one of them an enemy?”

Clinton bashed Trump’s call to temporarily ban Muslim immigration, saying “a Trump presidency would embolden ISIS.” Trump has vowed to hunt down the ruthless Islamic group, a fact Clinton didn’t mention.

But the fierce speech, while she is still battling Sen. Bernie Sanders for the nomination, shows Clinton is terrified of facing Trump in the fall and plans to hit him as hard as she can. Still, her own record may well do her in. Few think she accomplished anything as secretary of state, yet she hopes to persuade America that she did much. It won’t be an easy sell.