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- Donald Trump has publicly celebrated growing calls for Joe Biden to end his bid for reelection.
- But some in the GOP are worried that if Biden steps aside, it could make the race harder for Trump.
- Sen. Lindsey Graham on CBS said a new Democratic challenger would make the race "dramatically different."
Donald Trump has gleefully celebrated growing calls for Joe Biden to end his reelection bid, confident that he can defeat any Democrat who challenges him — but some members of the GOP aren't so sure.