They stuck with him through the Russia investigation and an impeachment, through catastrophes natural and man-made, and through all manner of scandal, from the comparatively trivial to the truly horrific. They’ve watched him praise dictators and alienate allies, erode democratic norms and institutions, and assert a vision of executive power that would have made Republican heads explode had Barack Obama come anywhere near such an expansive view of his own authority. But could Donald Trump failing to show leadership in seriously addressing the coronavirus pandemic finally turn away some supporters?

To be clear, there remains a base of Trump diehards who will stick with him no matter what; if that wasn’t already obvious from four years watching them rally around him through all manner of crises that would have ended any normal politician’s career, protesters in MAGA hats and carrying Trump flags demonstrating against life-saving lockdown measures in Michigan this week should serve as a potent reminder. However, there have been some signs of late that his bungling of the coronavirus crisis may be eating away at his base.

After a brief bump at the onset of the pandemic, polls have indicated Americans’ diminishing confidence in his response. With more Americans seeming to disapprove of his handling, his overall job approval ratings have slipped six points over the past month, down to 43%, according to a Gallup poll released Thursday. Meanwhile, Republican leaders who have mirrored his “nothing to see here!” approach to the pandemic have also taken a political hit, with Trump-allied Governor Ron DeSantis in swing-state Florida experiencing a drop in approval—even as other state leaders have seen significant approval spikes.

“It makes me wonder if there’s something brewing in the weaker elements of the Trump base,” Paul Maslin, a Wisconsin-based Democratic pollster, told the Associated Press on Friday. “Is the pandemic fight the final straw that’s going to cause some of this small slice of votes he needs to win these states to back away?”

An exodus of Republicans from Trump is extremely unlikely by November, but Democrats don’t need a full-scale GOP mutiny to win; picking off some Republican support in key states might do the trick, particularly if would-be Trump voters in 2020 battlegrounds are left feeling less enthusiastic about pulling the lever for him with the COVID crisis worsening on his watch. “We are starting to see more evidence that suburban voters disapprove of the way Trump is handling the coronavirus pandemic,” Democratic strategist Adrienne Elrod told the AP, suggesting the wins Democrats scored in Wisconsin this month—even with conservative thumbs on the scales against them—could be replicated elsewhere.

That scenario has Republicans concerned about his prospects this November’s election, which will almost certainly be a referendum on his handling of the crisis. Seemingly incapable of viewing the pandemic as anything but a threat to his reelection, Trump has found nothing in his bag of crude political tricks—unconvincing reassurances, compulsive feuding, blame-shifting—to shake this crisis as he’s shaken others before it. Seemingly giving up on throwing the virus off its deadly path, Trump is now at least trying to salvage the once-strong economy by “reopening the country” next month—and, it seems, attacking state leaders who have the audacity to try to stop their residents from contracting and spreading a disease that had already killed more than 33,000 Americans. “LIBERATE MICHIGAN!” Trump tweeted Friday, in all-caps nod at his supporters there who have demonstrated against Democratic Governor Gretchen Whitmer, whose name has been floated as a potential running mate for Joe Biden.