(CNN) — Homeland Security Secretary Kristi Noem is recommending that the Trump administration’s travel ban list include between 30 to 32 countries, marking an increase from the current list of 19 countries, according to a source familiar with the matter.

Nationals of countries on the travel ban list face restrictions on travel to the United States. The source said the list could continue to expand based on ongoing assessments, but it is unclear which countries are being added to the list — and when they’ll be announced.

The recommendation to the White House comes on the heels of the shooting in Washington, DC , that killed one National Guard member and critically wounded another.

The shooting suspect, Rahmanullah Lakanwal , is an Afghan national who previously worked with the US in

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