“What the [expletive] were we thinking?” he asked the other night inside a Walmart here, in an area of blue-collar suburban Detroit that helped deliver the presidency to Trump.

While Trump’s relationship with much of his base remains strong, two years after his inauguration his ties are fraying with voters like Daudert, the kind who voted in droves for Trump in key pockets throughout the industrial Midwest, flipping previously Democratic states to him in 2016. The shutdown fight, as it has played out over the past month, is further eroding the president’s support among voters who like the idea of beefing up border security — but not enough to close the government.

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Many here, even those who still support Trump, say they hold him most responsible. They recite his comment from the Oval Office that he would be “proud to shut down the government.” When he said it, they listened.

“It’s silly. It’s destructive,” Daudert said, adding that all he knows about 2020 is that he won’t be supporting Trump. “I was certainly for the anti-status quo . . . I’ll be more status quo next time.”

Here, far from the nation’s capital and in an area not dominated by federal workers, the government shutdown is resonating in an unusual way. A trampoline park is giving government employees and their families an hour of free jumping. A local credit union is offering low-interest loans for furloughed employees who need to replace lost salaries.

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Some local governments in the area are beginning to allow federal workers to defer payments on property taxes, utility bills and parking tickets. Food drives are being discussed to help Transportation Security Administration workers at Detroit’s airport, and a yoga studio is offering free classes for federal employees.

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“As a community it affects us because other people are being affected,” said Jasmin Cromwell, who runs Bodhi Seed Yoga & Wellness Studio, “whether we know them or not. Maybe I’m getting too yoga-like, but we are all connected. It affects everyone. It affects us as a nation.”

Recent polling indicates that the government shutdown has caused skittishness among parts of Trump’s base, which has been one of the most enduring strengths of his presidency. An NPR/PBS NewsHour/Marist survey, conducted Jan. 10 to Jan. 13, found that his net approval rating had dropped seven points since December.

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One of the biggest declines came among suburban men, whose approval rating of Trump fell a net 18 percentage points, while support from evangelicals and Republicans dipped by smaller margins. Among men without a college degree, the downward change was seven points.

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As Jeremiah Wilburn, a 45-year-old operating engineer, browsed the aisles at Walmart for a new pair of coveralls, he reflected on some of those shifts. Like many voters here, after siding with Barack Obama in two elections, he decided to gamble with Trump in 2016. And for most of the past two years, he was pleased. The economy was humming, jobs were flowing, and wages seemed stable.

Until now.

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“I was doing fine with him up until this government shutdown,” he said. “It’s ridiculous. You’re not getting the wall built for $5 billion. And Mexico is not paying for it, we all know that, too. Meanwhile, it’s starting to turn people like me away.”

He worries about the shutdown’s effect on the economy. He’s concerned about the impact on his brother, who works for the TSA in Florida.

To him, the shutdown standoff has also poked holes in Trump’s ability to say he cares for the working class, given that 800,000 federal employees and an additional number of contractors are going without paychecks.

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“You can’t expect people to come to work without getting paid,” Wilburn said. “If I were them, I certainly wouldn’t come to work.”

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Macomb County, in the suburbs north of Detroit, has been a perennial political battleground and a place where the broad sweeps of American politics can be seen. It was the most Democratic suburb in the country when John F. Kennedy was elected president in 1960, and then it helped usher in the phrase “Reagan Democrats” when Ronald Reagan won the White House two decades later.

Obama won the county twice, and then Trump defeated Hillary Clinton here by 12 points. The county is filled with the kind of white working-class voters whose flip to Trump has been the most heralded part of his coalition. Trump came here during his campaign and again in the final days before the 2016 election. He returned last year for a rally meant to pointedly spurn the White House Correspondents’ Association dinner that same night. It’s an area he has continued to nurture.

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But in the midterm elections, some of those voters started to peel away. Sen. Debbie Stabenow (D-Mich.) carried the county by two points, and Gov. Gretchen Whitmer (D) won by four points. Whitmer ran a campaign that barely mentioned Trump and instead promoted basic bipartisan governance, with the slogan: “Fix the Damn Roads.”

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The 2020 Democratic presidential primary contest is expected to include a heavy dose of debate over how to balance attempts to win back white working-class voters — those who live here as well as in states like Wisconsin and Pennsylvania, which Trump also won — with the energy around ascendant women and minorities.

Those attempts will also draw into question whether Democrats can find a way to articulate an immigration plan in areas like this, where the issue resonates. Trump’s insistence on building a border wall has hardened Democrats, whose most prominent policy now is to stop the wall. They rarely tout their own views on border security, but that issue remains important to many voters in industrial states.

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In focus groups after Clinton’s loss, Democrats discovered that immigration played a bigger role here than they thought it would.

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“People do want immigration managed,” said Stan Greenberg, a Democratic pollster who has been studying Macomb County voters since the 1980s. “Trump makes it hard because he’s so outrageous. You don’t want to give him an inch. But immigration is still an important issue, and Democrats will have to speak to it.”

Trump faces a countering demand of his own, placating former supporters who saw the border wall as a stand-in for more security and those who want his promise delivered.

Ken Janicki, a 66-year-old retired technology worker who voted for Trump, sipped his coffee the other day and put it in blunt terms.

“I am all for border security, a full wall around this country,” he said. “You come in legally, I’ll welcome you to be my neighbor. But you come in illegally, and I’ll introduce you to my friend Smith and my other friend Wesson.”

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Even with the shutdown, most in this land of strip malls and six-lane boulevards, automotive plants and single-family homes seem to feel better about the economy.

“We’re booming right now. How can I not like a guy that gives me more money and lowers my taxes?” said Jeff Cordel, a 57-year-old construction worker. “I haven’t heard the word ‘layoff’ since he’s been in, and that’s saying something around here.”

But there is also a nagging concern that a downturn could be coming, in part because of forces Trump has unleashed. Some overtime shifts have gone away. Several large buildings that once housed a Kmart or a bowling alley or a restaurant are now empty.

“Times have been good. But things are slowing down a bit,” said Matt DeVuyst, a 62-year-old electrician who had just polished off a large breakfast at Coney Island, a staple of the Michigan diner scene. “If they don’t find common ground with China, who knows? We’re stable but nervous. It’s the fear of the unknown.”

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Mike Keys, who in 2016 won a seat as a Democrat on the board of trustees in Macomb County’s Clinton Township, said the anxiety in the area can make Trump’s economic optimism seem slightly off-key.

“Yeah, the economy is getting better, there’s more jobs. But pay raises? We’re not seeing that,” he said. “If you haven’t gotten a substantial raise in the last five or 10 years, you see [Trump] talking about the greatest economy — there’s a disconnect.”

At a Kroger in St. Clair Shores, across a lake from Canada, residents were deeply divided.

In the cereal aisle, Henry Black, a 69-year-old who spent his career at General Motors, voted for Trump, likes what the president has done and had a dire warning for him if he shifts course on the border wall.

“Trump needs to stand firm on this,” he said. “If he gives in to the Democrats on this, he’s finished.”

Near the pharmacy, Erica McQueen, a 38-year-old from St. Clair Shores, voted for Trump and also has liked a lot of what he’s done. “But it gets overshadowed by the stunts he pulls,” she said.

The shutdown, she said, is one of them.

“The wall is getting out of hand,” she said. “It’s too much. It’s ridiculous. I’m sick of seeing it, I’m sick of hearing about it.”

Like other onetime Trump supporters, she’s now openly wondering if she can back him again.