President Donald Trump’s support has been on the decline since he entered office in January—but in a new poll from CNN, the president’s popularity among his previously-solid base is shown to be crumbling.

The newest numbers (pdf) suggest that even as Trump holds rallies in states that have been largely supportive of him, as he did last week in West Virginia, his approval ratings are eroding even among groups that have been fiercely loyal since he announced his presidential run two years ago.

Trump has been popular among white Americans without college degrees—winning 67 percent of the vote in this demographic in 2016—the broadest show of support from the group of any presidential candidate since 1980. The new survey, released Monday night, shows that only 35 percent of respondents in this group now “strongly approve” of the job he is doing as president. In February, 47 percent of whites without college degrees approved of Trump.

The poll was taken as Trump hit the 200-day mark of his term. The first six months of his presidency have been marked by inaction and scandal, with a Republican-controlled Congress unable to pass long-planned legislation repealing the Affordable Care Act, courts blocking Trump’s attempts to bar people from six majority-Muslim countries from entering the U.S., and an ongoing investigation into the Trump administration’s alleged ties to Russia.