Adam Afriyie's plan to steer leadership-backed legislation on an EU referendum through Parliament has been criticised by fellow Tory MP James Wharton.
Wharton suggested the move would delay and even "kill" the private member's bill he introduced in July, and hoped Afriyie would "rethink" his approach.
He said: "We need to build as broad a base of support for the bill as we can if we are to get it through Parliament and the policy of a renegotiation, followed by an in/out referendum, is the right one to do that and the right one for the country.
"I hope MPs will decline to support it as the ultimate impact might well be to kill my bill, which would only help those who don't want any referendum at all."
More top news
Bojan Krkic could make his first Premier League appearance of the season in Stoke's clash with West Brom on Saturday.
Tonight: a transgender 8-year-old, how a horse is helping a boy with Asperger's and a nurse who would prefer not to be noticed.
As we go into the Bank Holiday weekend, the changeable weather pattern looks set to continue.