Islamic extremism is rapidly spreading across the globe. This is largely due to the so-called “Islamic State.” Over the past few years, they’ve embarked on a violent campaign across the Middle East to establish Sharia law, sharing their horrific crimes on social media. By doing so, they also radicalize people living in the developed world and convince them to engage in unthinkable acts.

While ISIS is trying to spread Islam through violence, others are a bit more creative. Saudi Arabia, for example, does it by giving huge sums of money to Muslim-majority countries. The countries then take that money and fund religious projects.

Earlier this year, the Saudi government gave Bangladesh, a country 2,700 miles away, a $967 million dollar grant. Shortly after receiving the money, the cabinet of Sheikh Hasina, Bangladesh’s Prime Minister, approved a proposal to use the money to build over 500 mosques throughout the country. The project, which was designed to spread Islam, will reportedly cost roughly $1 billion. They plan on using the Saudi grant to cover most of the cost. The rest will be covered by the Bangladeshi government.

Abdur Rashid, the Chairman of the Islamic Studies department at Dhaka University, spoke out against the proposal, arguing that it’s dangerous to fund religious projects with Saudi money because they’re known for spreading Wahhabism, a form of violent Islamic extremism. “There is [a] risk of spreading Wahhabism across the country through these mosques” he explained, noting, “so, the government will have to be careful so that violent Wahhabism is not expanded.” This is because, according to him, “experience shows that the Saudi ideology of Wahhabism spreads incitement against other faiths.”

Rashid was not the only person worried about the spread of extremism. Rezaul Haq Chandpuri, a spokesperson for an organization representing Bangladeshi Sufis, the country’s religious minority, was equally worried. “Saudi finance is a concern. They may use their money to promote Wahhabism through these mosques.” Because of this, he argued that religious minorities living in the country would feel “helpless and insecure.”

Despite what’s being reported, Saudi Arabia denies giving the country money for their mosques. Awwad Al-Awwad told journalists, “this is simply not true.” He added, “Saudi Arabia has never committed to pay Bangladesh one billion dollars for the construction of Mosques. Any commitment by the Saudi government of this nature would only be considered after receiving an official request from the host country’s government. When such an agreement is finalized there would definitely be an official announcement by both countries.”

It’s likely that the Saudi government is denying the reports because they want to continue exporting terrorism to other countries around the world. Daniel Pipes, historian and founder of the Middle East Forum, has noted that Saudi Arabia’s foreign aid is usually extremely strategic. According to him, they give money to other Muslim countries in order to spread extremism. “[They] invested in buildings, organizations, media and people,” he explained, adding, “hundreds of billions of dollars later, Wahhabism is a powerful global force. One can see in many regions the impact of this decades-long campaign, from the United States to the Balkans to Pakistan to Indonesia. The Saudis continue to pour vast resources into building further Wahhabi infrastructure in multiple countries.”

This approach is very different than the one used by ISIS. Members of the so-called “Islamic State” believe that the best way to spread Islam is through violence. While they largely terrorize other Muslims in the Middle East, they’ve recently started inspiring sympathizers around the world to launch attacks.

As extremism continues to become an even greater global threat, it’s increasingly important that we secure our borders. President Trump must work with Congress to pass legislation making it more difficult for dangerous people to enter our country. He should also consider punishing Saudi Arabia. On top of that, he needs to figure out a way to successfully limit immigration from dangerous countries around the world since all of his previous attempts have all been blocked by activist judges.

Islamic extremism must not be allowed to spread any further than it already has. Countries that help fund the spread of terrorism, like Saudi Arabia, should be held accountable for their actions. President Trump needs work with Congress to make sure this type of activity doesn’t continue.