Sen. Jeanne Shaheen says Israel blockade of Gaza is a "shameful black mark on humanity"

A U.N.-designated group announced Friday that Gaza City is experiencing a famine and warned that it would spread without a ceasefire. Israel has refuted the famine declaration. As various aid groups work to get food into Gaza, Sen. Jeanne Shaheen told "Face the Nation with Margaret Brennan" that Israel's blockade of humanitarian aid to the enclave is a "shameful black mark on humanity."