There are many important steps that can be taken to protect against a Salafi terrorist attack. Let me name a few of them.
First, perhaps the most important thing we can do is to protect ourselves from terrorism is to get reliable information. For this reason, we will need to share information between agencies and even international bodies that have information.
Second, we will need to firm up our borders. In other words, when people come into the United States, we need to make sure that they check out.
Third, We also need to have greater diplomacy in the world, especially in the Middle East. Too many people hate the United States. In light of this some good diplomacy would be very important.