Biden sent a new letter to congressional Democrats on Monday.
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- Biden sent a stern letter to congressional Democrats reiterating that he has no plans to drop out.
- He said questions about him have "been well-aired for over a week" and "it's time for it to end."
- The list of Democrats calling for Biden to drop out is likely to grow this week.
As lawmakers head back to Washington today after their one-week recess, President Joe Biden is issuing a stern warning...