President TrumpDonald John TrumpWatergate prosecutor says that Sondland testimony was 'tipping point' for Trump In private moment with Trump, Justice Kennedy pushed for Kavanaugh Supreme Court nomination: book Obama: 'Everybody needs to chill out' about differences between 2020 candidates MORE's approval rating has dropped amid the ongoing partial government shutdown and is beginning to decrease even among his closest supporters, according to a new poll.

Trump's overall approval rating is currently 39 to 53 percent in the NPR/PBS/Marist Institute survey released Thursday, a net change of 7 points from the 42 to 49 percent in December.

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Among suburban men, one of the president's typically top-performing demographics, the percentage who approve of the president's job dropped from 51 to 42 percent, while disapproval among that group rose from 42 to 48 percent.

His support among white evangelical Americans remains strong, but even that category has decreased in support for the president amid the shutdown over the past month, from 73 percent in December to 66 percent this month.

Lee Miringoff, director of Marist Institute's polling center, said that it was unclear whether the cracks in the president's base were permanent or would heal with the resolution of the government shutdown, which entered its 27th day on Thursday.

Trump and congressional Democrats have remain at odds for weeks over the president's demand for more than $5 billion in funding to construct a wall along the U.S.-Mexico border.

"For the first time, we saw a fairly consistent pattern of having his base showing evidence of a cracking," Miringoff said. "Don't know if that's temporary — tied to the government shutdown — or a broader problem the president is having."

The NPR/PBS/Marist survey contacted 1,023 American adults between Jan. 10-13. The survey's margin of error is 3.8 percentage points.