Lord Evans of Weardale, a former head of MI5, and Amber Rudd, a former home secretary, backed a paper by Policy Exchange, the UK's leading think tank, which recommends revising and toughening Britain's ancient treason laws to prosecute terrorists who have fought in Syria.
Lord Evans praised the study as "timely and balanced," while Amber Rudd called it "an important contribution to the debate about how we keep our country safe."
The research paper argues that the UK's law of treason has "antiquated, excessively cumbrous" language; moreover, it is "ancient" and "unworkable" and it should be revised to "make it clear that it is unlawful to aid the enemy either in an international armed conflict or in a non-international armed conflict."
READ MORE: UK Terror Arrests Up by 17%, Highest Number of Terrorist Prisoners Since 2009
Touting life imprisonment as a proper punishment for treason, the authors expressed concerns over the number of British citizens who served with or supported groups opposing UK forces in non-international armed conflicts, as well as groups that attacked the UK, or even sought to.
The paper came out shortly after The Telegraph published a letter to the US attorney general allegedly written by UK Home Secretary Sajid Javid, who called prosecution in the US "more likely to be possible" due to more effective laws as he handed over Alexanda Kotey and Shafee El-Sheikh, British citizens and members of the notorious group of jihadists known as "The Beatles," to America to face trial without a death penalty assurance.
On Friday, Khalid Ali, a UK citizen who served with the Taliban for five years before coming back to the country in 2016, got a life sentence after being convicted of plotting a knife attack on MPs and making bombs for the Taliban. According to the authors, he should have been prosecuted as soon as his involvement with the terrorist group came to light.
