He said "my view is a dead terrorist can't cause any harm to Britain".
The minister also told the newspaper that jihadist groups in Libya, Iraq and Syria were believed to be plotting attacks on the United Kingdom, and that "our job in terms of eliminating will not stop this year, will not stop next year - it is something we have got to continue to pursue".
Other terror experts have said they should instead be reintegrated.
Adopting a tough stand against the Britons who joined the Islamic State (ISIS) group in Syria and Iraq, the new UK Defence Minister Gavin Williamson has said that they should be eliminated and never be allowed to return to the country. "I do not believe that any terrorist, whether they come from this country or any other, should ever be allowed back into this country", he added.
At least 800 Britons have gone to Syria and Iraq to fight for IS and 130 of those have been killed in conflict.
"A dead terrorist can't cause any harm to Britain", he told the Daily Mail - prompting questions about whether the Ministry of Defence had drawn up a "kill list".
Prominent British militants such as Mohammed Emwazi, known as Jihadi John, and Sally Jones, have been reportedly killed by British or US forces since travelling to fight for Islamic State.
However, under British and global law, an aspiration to eliminate all known British IS recruits will take a little more consideration than simply launching a drone laden with fire-and-forget missiles, the BBC says.
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