6 AM ET: New border limit, Hunter Biden's ex-wife, Boeing tries again & more

Strict new rules are now in place at the US-Mexico border after an executive order came into effect at midnight. Hunter Biden's ex-wife is expected to testify at his federal gun trial today. Dangerous heat is hitting states in the West this week. Senator Bob Menendez's legal worries haven't stopped his son from winning his Democratic primary in New Jersey. And, Boeing is once again trying to launch its Starliner spacecraft.

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