Conservative vice-chairman Michael Fabricant said the party's voice was "muffled" and unclear following the defeat in the Eastleigh by-election.
The MP took to Twitter to argue that the party needed to "simplify its message":
#Eastleigh The Conservative voice is muffled and not crisp. It does not clearly project Conservative core policies or principles.
#Eastleigh The Cons Party must now co-ordinate & simplify its message without policy distractions away from core principles. 26 months
#Eastleigh Everyone from the PM downwards must focus on the economy, immigration, crime, Europe and not allow other side policies distract
More top news
Thousands of protesters have swarmed into the US capital and cities across the world to march for gun control.
The tech firm has submitted proposals for 13 emojis depicting wheelchair users, bionic arms, guide dogs, hearing aids and walking sticks.
Cloudy and damp across much of England and Wales, although the rain should turn lighter and more patchy by the afternoon.