BIRCH RUN, Mich. — Donald Trump says his campaign is prepared to lay out specific policy plans. He’s just not ready yet.

And in the meantime, he’s selling his strong personality and criticizing his rivals, particularly Jeb Bush for a lack of vigor.

“There’s no energy there, no energy. We need energy. We need tone,” Trump said of Bush during a 50-minute speech to more than 2,000 people at a Republican fundraising dinner in Michigan, his first public appearance since the first GOP primary debate. “We have heads being chopped off because there are Christians in the Middle East. ... The world is cracking up and they’re worried about my tone.”

It was Trump’s first appearance as a presidential candidate in Michigan, where he decried China’s decision to devalue its currency and Ford Motor’s planned $2.5 billion investment in Mexico. He told reporters he would announce policy specifics over the next two weeks, but cautioned: “You really have to be flexible on jobs and everything else.”

Trump said currency devaluation “means suck the blood out of the United States” and vowed if he were president, a Ford plant planned in Mexico would be built in the United States, preferably Michigan.