Carmakers used the Detroit Auto Show to talk up their U.S. production, in a likely reaction to President-elect Donald Trump's all-hours tweet storms, an industry analyst said on Tuesday. John Rosevear, senior auto specialist at The Motley Fool, told CNBC's "The Rundown" on Tuesday that it was a repeated theme at the annual auto show. "It's clearly a new and big movement across the board," he said. "Every press conference, every discussion we have today, it seems like some executive from any of the automakers is at pains to talk about what they make in the U.S., how much they make in the U.S." Rosevear noted that a VW conference highlighted that its SUVs were being made in Tennessee, while Toyota went so far as to display a Camry model with "Made in U.S.A." painted on the side. "It's being talked up obviously at the Detroit-based automakers, but also at a lot of what we call the transplants, the overseas companies doing business here in the U.S. too." Automakers new focus on flag-waving has followed a series of all-hours tweets from Trump lambasting, sometimes inaccurately, plans to produce vehicles in Mexico. Trump has previously called Ford "horrible" for its plans to move all small-car production to Mexico within three years, and has threatened to impose a border tax on automakers which move production abroad. Earlier this month, Ford announced that it was scrapping plans for a $1.6 billion plant in Mexico and instead would invest $700 million in the Flat Rock assembly plant in Michigan.

Ford Mustangs go through assembly at the Ford Flat Rock Assembly Plant August 20, 2015 in Flat Rock, Michigan. Getty Images

On Monday, Ford CEO Mark Fields told CNBC that Trump's proposed tax or trade reforms would not influence Ford Motor's long-term goals. Fields said the company cancelled production of the plant because it "didn't need the capacity anymore." In a tweet last week, Trump also criticized Japanese automaker Toyota Motor for plans to build a new plant in Mexico. In response to Trump's tweet, Toyota said in a statement to Reuters that the new Mexican plant will not cut its U.S. employment. Also this month, Trump issued a separate ultimatum to General Motors: Make its Chevy Cruze cars in the U.S. or expect to pay a big border tax. GM responded by saying it built the Cruze hatchback in Mexico for global markets with a very small amount sold in the U.S. Of the 190,000 Cruze cars sold in the U.S., 185,500 were built in Lordstown, Ohio, the company said. The Motley Fool's Rosevear said it wasn't clear if automakers' "made in U.S.A." mantra was out of fear of being called out in a Trump tweet storm. For one, automakers were highlighting that their decisions to shift production to the U.S. weren't in reaction to Trump. "They're positioning it as something that just happened to come up this week," Rosevear said, although he added, "Enough times of hearing that and you have to think more is going on behind the scenes." Certainly, however, it's unlikely that automakers were making billion-dollar production and factory-building decisions in the space of mere weeks.