“Our farmers are GREAT, but because of their GREATNESS, they are always put on the Front Line with our adversaries, such as China, whenever there is a Trade negotiation or, in this case, a Trade War,”
Must be nice, being a farmer and then Trump calls you GREAT...
They already know it isn't going anywhere (mostly due to their own fault). So they don't want to be a part of it, since there's no opportunity to boast later on.