linguistic:voice_change, linguistic:paraphrasing
Mandatory spending and entitlements

Since the government borrowed and spent the trust funds' assets, there is no "lockbox" or marketable investment portfolio of $2.4 trillion for Social Security or $380 billion for Medicare. The trust funds contain non-marketable treasury securities that the government is legally obligated to pay. In the absence of a balanced budget, the government will be required to convert these non-marketable securities to marketable securities by borrowing in the future, as trust fund claims are redeemed.