After critics savaged his performance at Monday’s first presidential debate, Republican nominee Donald Trump alighted on several culprits: Hillary Clinton, the moderator, and especially his microphone.

The claim was met with some skepticism, but on Friday afternoon, the Commission on Presidential Debates seemed to confirm his claim, at least in part. The commission, which controls the debates, released a cryptic statement that reads in full:

Statement about first debate Sep 30, 2016 Regarding the first debate, there were issues regarding Donald Trump's audio that affected the sound level in the debate hall.

We’ve called the commission to ask what that means, but have not heard back yet. Presumably, they are receiving dozens of such queries.

After the debate, Trump told reporters, “They gave me a defective mic. Did you notice that? My mic was defective within the room. I wonder, was that on purpose? Was that on purpose? But I had a mic that didn't work properly.”

The next day he repeated the complaint. “I had a problem with a microphone that didn't work. I don't know if you saw that in the room. My microphone was terrible. I wonder was it set up that way on purpose. My microphone in the room, they couldn't hear me, you know, it was going on and off. Which isn't exactly great. I wonder if it was set up that way, but it was terrible. When I tested, it was beautiful, like an hour before, I said what a great mic.”