Hours after President Trump was spotted Monday partaking in public Memorial Day remembrances without a face mask, he hopped on Twitter to retweet a Fox News commentator criticizing former vice president Joe Biden, the presumptive Democratic nominee, for wearing one.

“This might help explain why Trump doesn’t like to wear a mask in public,” Brit Hume, Fox News’s senior political analyst, tweeted Monday evening, sharing a picture of Biden at a Delaware veterans memorial earlier that day. In the photo, which documents Biden’s first public appearance since mid-March, most of the 77-year-old’s face is obscured by a black mask and a pair of aviator sunglasses.

Memorial Day offers array of contrasts as Biden and Trump salute war dead, with and without masks

Hume’s tweet sparked instant backlash from a number of critics on the left. By early Tuesday, Hume was still trending on Twitter as detractors questioned whether he valued Biden looking “cool” more than encouraging efforts to slow the spread of the potentially deadly novel coronavirus that has now killed more than 97,000 Americans.