Live updates: Trump shooting puts Secret Service under scrutiny

• The Secret Service is under growing pressure to explain what went wrong in the days and hours before an attempted assassination on Donald Trump at a Pennsylvania rally.
• The Secret Service says it is not substantially changing its security plan for the Republican National Convention in Wisconsin, which is an open-carry state.
• The FBI is conducting its own investigation into the rally shooting and several members of Congress have called for hearings and probes.

Editor's note: This is a developing story and will be updated throughout the day.

The Secret Service is under growing pressure to explain what went wrong in the hours and minutes before a gunman opened fire in an attempted assassination on former President Donald Trump at his Pennsylvania rally on Saturday.

One attendee was killed and two were critically injured before a sniper fatally shot 20-year-old Thomas Matthew Crooks on the roof of a building about 400 feet from the rally stage.

"The Secret Service is working with all involved federal, state and local agencies to understand what happened, how it happened, and how we can prevent an incident like this from ever taking place again," Secret Service Director Kimberly Cheatle said in a statement Monday.

The Secret Service is not substantially changing its security plan for the RNC, which takes place from Monday to Thursday, Cheatle said, despite the Saturday shooting.

"I am confident in the security plan our Secret Service RNC coordinator and our partners have put in place, which we have reviewed and strengthened in the wake of Saturday's shooting," Cheatle said.

On Sunday, Secret Service RNC coordinator Audrey Gibson-Cicchino also stood by the convention's security plan, which she said had been developed over