A leading member of the Campaign Against Arms Trade (CAAT) has blasted Sir Michael Fallon's comments about MPs.
The Defence Secretary implied criticism by MPs of the human rights record held by Saudi Arabia could affect sales of arms with the country, saying it was not "helpful."
Members of opposition parties immediately condemned Fallon for what he said.
Andrew Smith, who represents the Campaign Against Arms Trade, joined the chorus of disapproval by saying the Defence Secretary seemed to be calling for people to stop asking the "hard questions."
He told Julia Hartley-Brewer: "The comments were staggering, they were disgraceful.
"He was calling on MPs to self-censure in order to help him to sell weapons. That’s not why we elect MPs, we do so in order for them to represent our views and speak their minds.
"Michael Fallon seems to think MPs are elected to do what Saudi Arabia and other powerful dictatorships tell them to do.
"I think it’s indicative of the Government mindset, which is 'shut up and let us go about our business'."