Donald Trump said CNN’s Don Lemon is “dumb as a rock” in a post on Twitter on Wednesday.

“Don Lemon is a lightweight — dumb as a rock,” Trump posted, praising Dan Bongino, a former Secret Service agent and a GOP congressional candidate in Florida. Bongino defended Trump’s recent statement on the Second Amendment that the media and Hillary Clinton campaign suggested incited violence.

.@dbongino You were fantastic in defending both the Second Amendment and me last night on @CNN. Don Lemon is a lightweight – dumb as a rock — Donald J. Trump (@realDonaldTrump) August 10, 2016

“It’s clear he’s trying to motivate people to go out and vote based on the potential for an open Supreme Court seat,” Bongino stated during an appearance on CNN Tuesday night.