Critics have repeatedly accused him of blurring the lines between those roles.
Mr Duncan Smith had over-stepped his authority, blurring the lines between the party organisation and the leader's office.
Seamless connectivity is blurring the lines and freeing workers from their cubicles.
By blurring the lines between enterprise technology and communities, business networks eliminate the barriers to commerce, and frankly, make it more simple and effective.
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Broadcasters are blurring the lines too, by becoming providers of sport.
Print purists warn against blurring the lines between books and videogames.
"I do think the blurring of the lines needs to be looked at, " said Nigel Le Gresley, chairman of the Essex branch of the Magistrates' Association.
Jeff Jarvis, a magazine and newspaper veteran who blogs at BuzzMachine.com, hails the blurring of the lines between traditional media and the blogosphere as a positive development.
This blurring of the lines between public and private is not that unusual in China.
But legal experts have questioned the criteria for including suspects and the blurring of lines between intelligence services and the police.
The fourth change is the blurring of the old demarcation lines between broadcasters and providers of sports.
Nor can the present federal agencies deal with thousands of new products, many resulting from the blurring of lines between banks and brokers.
In speeches he has made subsequently, Lord Butler has been highly critical of the blurring of lines between political appointees and civil servants.
But it upset government finances, forcing local authorities to rely on the state and blurring lines of accountability.
But for me the lines are blurring as all sorts of knowledgeable topic-specific experts are self-publishing great information and perspective that is hugely valuable to audiences who want to know.
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At a time when the lines between government and business are blurring and most pundits are quick to color them over with the promise of technology, Khanna has given us an important guide that will help us run the world into the future.
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