Here is a detailed summary of the provided content:
- Recent events have raised national security concerns in the United States.
- In March, there were four alleged terror attacks linked to individuals who are naturalized U.S. citizens.
- The incidents highlight significant security vulnerabilities within the country.
- A security expert brought attention to these issues during an appearance on Fox News.
- There is an urgent need to address the critical gaps in America’s security infrastructure.
Source: https://www.foxnews.com/politics/string-attacks-connected-naturalized-citizens-raises-national-security-questions)