Millions of seniors on Social Security are at risk of losing benefits this summer if the GOP doesn't raise the debt ceiling, Janet Yellen says

• Treasury Sec. Janet Yellen reiterated the consequences of failing to raise the debt ceiling.
• She said defaulting on the national debt could strip Social Security benefits from seniors and veterans.
• The GOP is currently negotiating a deal to raise the debt ceiling, including spending cuts.

The nation's top Treasury official just issued another warning on the consequences of failing to raise the debt ceiling.