Fox News apologized for airing old video of a hatless President Donald Trump during coverage Sunday of his attendance at the dignified transfer ceremony for U.S. soldiers killed in the Middle East war, insisting it was an honest mistake.

In a polarized time, some online critics suggested without evidence that it wasn’t an error — that the network was trying to make Trump look better by not showing him wearing a baseball cap during what is considered one of the most solemn duties of a commander in chief. The return of the bodies of six soldiers took place Saturday at Dover Air Force Base.

But Fox News said archival footage of Trump at an earlier ceremony was inadvertently pulled up by a staff member and used on two Sunday morning telecasts. A spokeswoman noted the correct footage was used at other times, including on Saturday.