Radical Islamic terrorism continues to be a major problem around the world. To make matters worse, Muslims extremists living in the UK are visiting the Middle East and being trained by terrorists. They then return and wait for the right moment to attack.

According to reports, over 850 UK citizens have gone to Syria to support or fight for the so-called “Islamic State” (ISIS). While overseas, they get trained by ISIS militants and in some cases, fight against British troops. Shockingly, nearly 400 of those who left have since returned and about half of them are currently living in London, the country’s capital. Despite this, Sadiq Khan, the city’s mayor, is doing nothing to keep an eye on them and was rightfully scolded for it on live television.

Earlier this week, Khan went on Good Morning Britain to talk with Piers Morgan and his co-host, Susanna Reid, about the most recent terror attacks in the UK. During the interview, Khan was asked why the local government didn’t know the whereabouts of the many ISIS-trained jihadists currently living in the city.

Specifically, Reid asked, “how are we letting people back into the UK — who haven’t just been trained, they’ve actually fought, potentially against our troops — how are we letting them back in without knowing exactly where they are? Because out of all the thousands of people we’re concerned about, surely those who’ve actually gone to fight are the biggest risk.”

Instead of taking responsibility for not doing a better job at monitoring dangerous people, Khan replied by blaming the central government for not giving the Metropolitan Police Service (MET) more money. “That’s one of the reasons it doesn’t make sense for the government to be cutting resources from [the police departments],” he argued.

Indignant, Reid pushed back, asking, “but where are they? You’re the Mayor of the capital city.” She believes that as mayor, he has a duty to know about likely terrorists living in the city.

In response, Khan claimed that he can’t follow hundreds of people “What I can do is make sure the resources for the police and the experts [are available],” he added.

Unsurprisingly, Morgan was not persuaded by his answer. “But why can’t you?” he pressed, adding, “why can’t you instruct the police? Why can’t you call [the commissioner of the police] right now and say [that] every one of those people has come back from a war zone [and you] want them followed?’”

Frustrated, Khan replied, “Let me tell you why. Because the MET police budget is, roughly speaking, 15-20% is funded by me, the Mayor. The rest comes from central government. If the MET police budget is being shrunk and reduced, they’ve got to prioritize and use their resources in a sensible and sane way.”

But clearly, this is absurd. A shrinking budget is no excuse to not monitor terrorists. Fortunately, Morgan understands this. He responded by asking, “what could be a bigger priority than people coming back from a Syrian battlefield with the intent to harm British citizens? Why’s it not the number one priority? Why are these people allowed to just come back in in the first place and then the London mayor does not have a clue to where any of them are?”

Humiliated, Khan refused to answer the question, signaling defeat. Instead, he attempted to excuse the failure of the city’s law enforcement to properly monitor dangerous people by bringing up the fact that the recent attacks were done by people born and raised in the UK.

However, this point is largely irrelevant to what they were discussing. Regardless of whether or not the attacks were done by UK nationals, failing to monitor known citizens who visited Syria to trains and fight with ISIS is a major issue because it jeopardizes the lives of a vast number of people. Since he has proven incapable of doing what is necessary to protect his constituents, he needs to be voted out of office and replaced by someone who will do whatever it takes to prevent terrorist attacks.

Anyone from the UK who visits the Middle East to support radical Islamic terrorism should lose their citizenship and not be allowed back in the country. Failing to do so will likely result in the deaths of innocent people. Letting known jihadists back in is simply not worth the risk.