President Obama called for Congress to “get on board” with more infrastructure spending and a new round of middle-class tax cuts Monday, as he delivered a campaign-style speech that served as a warm-up to a vital jobs address later this week.

Interrupted repeatedly by chants of “four more years,” the president marked Labor Day in Detroit at a rally with the nation’s top labor leaders. He used the address to underscore his alliance with the labor movement — at a time when cracks are starting to show — and preview some of the proposals he’ll outline during a speech Thursday before a joint session of Congress.

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