Andrew Murrison had said there were ‘no plans’ to introduce national service
The Home Secretary said there would be no criminal sanctions for young people who did not take part.
The party leader said anyone paying tax should ‘have a say’ in how their money is spent as he was questioned about the commitment on Saturday.
Rishi Sunak is understood to be attending an event in the north of England.
Paul Maynard broke expenses rules by using a state-of-the-art printer for campaigning purposes