The Facts

• After Donald Trump survived an assassination attempt at a Pennsylvania rally Saturday, Pres. Joe Biden said he's "directed an independent review of the national security" to probe how a shooter could manage to evade the US Secret Service and get onto a roof in close proximity to a presidential nominee.

• Biden also said he has asked the Secret Service to review all security measures ahead of the Republican National Convention, which begins in Milwaukee on Monday. He added that the investigation is underway to find a motive for the assassination attempt.

• House Oversight Committee Chair James Comer (R-Ky.) has asked Secret Service Director Kimberly Cheatle to testify at a July 22 hearing, while House Homeland Security Committee Chair Mark Green (R-Tenn.) has sought answers from Homeland Security Secretary Alejandro Mayorkas.