This is an important ruling and, in my view, the right one.
Ms Begum left the UK in 2015 to join the so-called Islamic State (IS).
People who chose to leave the UK to be indoctrinated by fundamentalists and trained by killers present a serious threat to the national security of this country.
The home secretary at the time had to make a serious choice.
By revoking Ms Begum’s citizenship and denying her re-entry to the UK, he fulfilled his duty to keep the country safe.
Allowing IS members to come back can only help fuel homegrown terrorism and extremism, threatening the lives of innocent citizens.
Fighting terrorism requires a vigilant and hard-headed approach from our government and law enforcement, which is why this court ruling is so important.
There are some, including many in the Labour Party, who have been more worried about helping Ms Begum than about the real victims of the civil war in Syria.
For a decade, IS and the Assad regime have brutalised the Syrian people and persecuted minorities.
We must remember the real victims of this conflict and the need to bring the bloodshed to a close.
I am especially saddened by the plight of the Yazidi community, whom IS used murder, slavery, and torture to commit genocide against in 2014.
Six years on, the consequences of this violence are still deeply felt as many Yazidis struggle to access healthcare and education.
More than 3,000 people are still missing.
Just last month, the Yazidi community buried 104 members who were exhumed from mass graves.
But we should also think long and hard about what led a 15-year-old schoolgirl to leave her family to join IS.
We need to do more to prevent radicalisation and homegrown terrorism.
Covid remains the biggest challenge facing the world today, but there will still be many global dangers threatening our national security in the years ahead.
We must remain vigilant.
Robert Largan is MP for High Peak