Ukraine crisis across the disrupts US campaign

First: President Biden pins the blame on Republicans for the fall of a Ukrainian city, while Donald Trump tries to make himself a martyr after the suspicious death of a Kremlin critic. 

Plus: Joe Biden is facing a new call to step aside as a prominent columnist says he's a great president but shouldn't run again. 

And: Brand new CNN reporting on why so many top Republicans are deciding not to run again. 

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