What is the name of the issuer of mortgage-backed securities that is backed by the full faith and credit of the United States Treasury?

The issuer of mortgage-backed securities backed by the full faith and credit of the United States Treasury is Ginnie Mae. This organization plays a crucial role in the secondary mortgage market by facilitating the issuance of mortgage-backed securities that are guaranteed by the government. This means that investors in these securities receive timely payments and have a strong assurance regarding the security of their investment, as the U.S. Treasury backs it.

Ginnie Mae's guarantee is particularly significant during economic downturns or times of financial instability, as it reinforces confidence in these securities. By ensuring that investors will receive their payments, Ginnie Mae helps lower the cost of borrowing and provides liquidity in the mortgage market, which can lead to more accessible home financing for consumers.

In contrast, FNMA (Fannie Mae) and Freddie Mac are also government-sponsored enterprises but do not carry the full backing of the U.S. Treasury in the same way that Ginnie Mae does. The FHA primarily focuses on home loan insurance rather than issuing securities. Therefore, Ginnie Mae stands out as the correct answer due to its unique position and the nature of the investment backing it provides.