Senate Republicans blocked a major bipartisan border deal and foreign aid package. Sen. James Lankford, one of the GOP’s most conservative members, helped craft the deal that would have established restrictive border measures, something Republicans have demanded be part of the bill. Former President Trump is making border security a central campaign issue as he tries to beat President Biden in November. Republican Rep. Dan Crenshaw tells Anderson Cooper why he's "frustrated" by the process. Plus, the Supreme Court meets tomorrow to hear arguments on Trump's eligibility to appear on Colorado's ballot. CNN Legal Analyst Carrie Cordero joins AC360 to discuss what she thinks are the former president's strongest and weakest arguments in this case.

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