Washington (CNN) The Transportation Security Administration plans to send hundreds of officials to help with efforts to deal with migrant inflows on the southern border just as the busy summer travel season begins, according to an internal email obtained by CNN.

The task of the TSA workers, which a source said will include air marshals, will be to assist temporarily with immigration duties. TSA acknowledged in an internal email the "immediate need" comes with the acceptance of "some risk" of depleted resources in aviation security.

TSA plans for the deployments to involve up to 175 law enforcement officials and as many as "400 people from Security Ops," according to two sources and the email. 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.

"There is now immediate need for more help from TSA at the SW border," a senior TSA official, Gary Renfrow, wrote in the email to agency regional management. "TSA has committed to support with 400 people from Security Ops" who will be deployed in waves "similar to support for past hurricanes."

"We also understand that we are accepting some risk as we enter a very busy summer," Renfrow wrote, calling this effort an "additional challenge."

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