5/4: Pfizer vaccine could soon be authorized for kids as young as 12. A train plummets to the ground in Mexico City.

We have breaking news from Mexico City, where the collapse of an elevated train track has killed at least 23 people and injured dozens more. There's widespread destruction from more than two dozen reported tornadoes across the South. In the next several days, Pfizer's coronavirus vaccine is expected to get authorization for use in many children. Dr. Ashish Jha joins us to discuss. The FBI is investigating after law enforcement shot a man who they say was armed, outside the CIA's headquarters. The Republican-led effort to tighten state voting laws is getting a new burst of support from former President Donald Trump. There were calls for justice and transparency at the funeral of a man killed by sheriff's deputies in North Carolina.

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