A request to the Department of Homeland Security could bring about a closer look at holders of airman certificates to find possible security threats.

Concerned that reports show people with connections to terrorism and other criminal activities hold valid airman certificates, four senators have asked the Inspector General of the Homeland Security Department to study the certificate vetting system and correct any weaknesses. The senators want to know how Transportation Security Administration vetts the names of individuals holding valid certificates and what action is taken when a person holding a certificate is determined to present a security threat.

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