Trump maintains lead, but ...

First: A new poll shows Donald Trump hanging onto a commanding lead, but one of his rivals for the Republican presidential nomination is starting to see a narrow path to a major upset. 

Plus: Senators are racing to find a way forward on new border security measures. President Biden is facing pressure on one of the toughest-to-solve in American politics. 

And: Democrats have never been this nervous about Biden's chances in 2024. We ask the pollster who helped elect Bill Clinton what the Biden campaign could be doing differently. 

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