How can national security possibly be threatened when a nation engages in free trade and specializes on the basis of comparative advantage?

What will be an ideal response?

Free trade is based on comparative advantage and specialization. A country specializes in the production of a good in which it has a comparative advantage. Hence, when a nation engages in free trade, resources that are required for strengthening the defense of a country are likely to be guided toward the production of goods that have an export potential. Moreover, specialization may cause a nation to import military weaponry if it does not have a comparative advantage in its production. If a crisis develops with the country from which such weapons are being imported, it is unlikely that they may continue to export. This hampers the ability of a country to preserve its integrity in times of war and thus acts as a threat to national security.