Britain on Monday said it will ban the political wing of Hezbollah, making membership of the movement or inviting support for it a crime.
"We are no longer able to distinguish between their already banned military wing and the political party. Because of this, I have taken the decision to proscribe the group in its entirety," he said.
The ban is subject to a vote in parliament this week.
Hezbollah is a Shiite militant movement established in 1982 during the Lebanese civil war.
Its capture of two Israeli soldiers in 2006 sparked a 34-day war in which 1,200 people were killed.
The movement, now a major political party in Lebanon, holds three cabinet posts.
"This does not change our ongoing commitment to Lebanon, with whom we have a broad and strong relationship," he said.
The government is also banning Ansarul Islam, a jihadist group which emerged near the border between Mali and Burkina Faso in 2016, and the Group to Support Islam and Muslims (JNIM), which has sworn allegiance to Al-Qaeda in the Islamic Maghreb.
Britain currently has 74 international terrorist organisations proscribed under the Terrorism Act 2000.
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