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At least initially, the efforts will not involve uniformed airport screeners, according to the email, which says that some parts of TSA would be asked to contribute "around 10%" of its workforce.

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The deployment will initially include approximately 42 law enforcement officials and grow to about 175, the source said. Officials expect the contingent to ultimately include federal air marshals who typically fly in plain clothes on commercial flights to prevent terror attacks.

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The email indicates the bulk of the deployment will be non-screening staffers who work for TSA's federal security directors.

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TSA staff will include 175 law enforcement officials, including air marshals, and as many as 400 security staff drawn from six U.S. cities but will not include airport screeners... The six cities were not immediately identified.

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A TSA official speaking on the condition of anonymity said the DHS has not yet approved the list of 200 employees identified, but that it would not include any frontline personnel who deal with travelers at airports.

Instead, the TSA would send lawyers, immigration specialists, and personnel who can help with meal prep and wellness checks, the official said.

The deployment would also include air marshals to help with security. Typically air marshals respond to security threats on planes and in airports, carrying firearms to respond to emergencies.

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The email indicates the bulk of the deployment will be non-screening staffers who work for TSA's federal security directors. Second priority will be inspectors; a 2018 post on the TSA website describes that job as conducting "inspections, assessments and investigations of airlines and individuals to determine how well they comply with regulations."