This is a portion of a recent reader comment for an article in the Washington Post:
"[Trump] leaves himself open to the charge that he is violating his oath of office"
He is, and so is Ryan and McConnell.
My question is whether the second sentence is grammatically valid.
My gut reaction is that it is not, and it should be written in one of the following ways:
He is, and so are Ryan and McConnell.
He is, and so is Ryan and so is McConnell.
But it really doesn't take much effort to interpret the writer's second sentence as a shorthand form of "He is, and so is Ryan and [so is] McConnell".
My question is whether the writer's shorthand form is grammatically valid.
Updated to show a screen shot of the complete comment from the poster:
