A group of U.S. special forces has warned about terrorists coming to America, thanks to President Joe Biden’s open borders policy.

The group issued the warning through an open letter signed by Christopher Miller, chairman of the Special Operations Association of America (SOAA). The group is composed of Army Rangers and Green Berets, Navy SEALs, Marine Raiders, Air Force Air Commandos and other special forces.

According to the letter, America faces a “gravely” serious threat of a terrorist attack inside the country. Miller also wrote that the SOAA is “concerned by the current heightened risk of terrorist attacks against targets inside the United States and both U.S. and allied interests abroad.” The SOAA chairman added that the wide open southern border with Mexico is another factor for this.

“This risk is compounded by developments in the Middle East and the porous, unsecured southern border through which we have seen numerous instances of individuals on terrorist watchlists and others from adversarial countries attempt to enter the U.S.,” Miller continued. (Related: Biden’s “unsecured southern border” a domestic terror threat, says U.S. special ops group.)

“Those are the ones we know about only because they were detected. We do not know how many other terrorists are already currently inside the United States.”

According to Miller, who served as acting defense secretary toward the end of former President Trump’s first term, Biden’s slapdash withdrawal from Afghanistan is the main reason for this threat. This, he added, has left America “without a viable stay-behind or over-the-horizon counterterrorism and intelligence capability to suppress threats.” It has also facilitated a power vacuum that has allowed extremist groups to flourish again.

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