Washington (CNN) A new internal document obtained by CNN shows the Transportation Security Administration's proposal to eliminate screening at more than 150 small to medium sized airports is just one of several cost-saving measures the agency is discussing.

The document, which an agency source says TSA Administrator David Pekoske was briefed on last month, shows how the TSA could save more than $300 million in 2020.

Among the proposed cuts listed in the document are a reduction in full-time air marshals, a reduction in the workforce at TSA headquarters, fewer reimbursements to airports for janitorial services at TSA checkpoints, cuts for benefits for new part-time employees and a 50% cut in reimbursements to state and local law enforcement agencies for use of their K-9 units.

The TSA did not respond to multiple requests for comment.

Spending cuts would have to be approved by Congress, which sets the TSA's budget.

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