The assassination

the attempt on Donald Trump is raising major questions about the Secret Service and its security protocols.

Chief among them, how was a 20-year-old armed with an AR-15 style rifle able to obtain a clear line of sight to a

former president.

President Biden has ordered an independent review.

This afternoon Homeland Security Secretary Alejandro Mayorkas said that security had previously been enhanced for former President Trump and that independent candidate Robert F Kennedy Jr. would also now receive secret service protection.

For more on this, I spoke earlier with Carol Lettig,

Pulitzer Prize winning reporter for the Washington Post,

and the author of Zero Fail,

the rise in the fall of the Secret Service.

Carol, welcome back to the news hour.

Thanks for joining us.

Glad to be here, Amna.

So on this central question of how a gunman got up on a roof within a line of sight of a former president fired several

shots before the Secret Service could evacuate him.

What is your reporting shell about how that happened?

You know, this is the central mystery and concern.

There are some answers and there are some things we're still trying to figure out.

But since 1963, and John F. Kennedy's assassination of Dallas from a gun

penny in a tall building.

Every Secret Service agent who's responsible

for planning security for an event

...