Trump shooting updates: Shooter flew drone near site hours before shooting

Over a week after the assassination attempt made on Donald Trump during his campaign event in Pennsylvania, the former president has confirmed he was not warned of the gunman's presence at the rally before shots rang out.

During an interview with "Fox News" Sunday, Trump said that "nobody" warned him not to take the stage, even after the U.S. Secret Service spotted the rally shooter.

"Nobody mentioned it; nobody said it was a problem," Trump said when asked if was warned.

"They could've said, 'Let’s wait for 15, 20 minutes, five minutes,'" Trump continued, adding he believes it was a "mistake."

Trump then questioned how the suspected shooter got on the roof and why he wasn’t reported despite people seeing him.

"How did somebody get on that roof? And why wasn't he reported?" Trump asked.

Trump’s running mate Sen. JD Vance, who joined the interview, echoed the sentiment, saying he believes "there are a lot of good field agents" but added someone higher up "really screwed up."

-ABC News' Soorin Kim

The U.S. Secret Service issued a statement to ABC News in response to questions about a Washington Post report that top U.S. Secret Service officials "repeatedly denied requests for additional resources and personnel sought by former President Donald Trump's security detail in the two years leading up to his attempted assassination at a rally in Pennsylvania on July 13."

Secret Service spokesperson Anthony Guglielmi issued a statement to ABC News, saying, "The Secret Service has a vast, dynamic and intricate mission. Every day we work in a dynamic threat environment to ensure our protectees are safe and secure across multiple events, travel and other challenging environments. We execute a comprehensive and layered strategy to balance personnel, technology and specialized operational needs."

Guglielmi added, "In some instances where specific Secret Service specialized units or resources were not provided, the agency made modifications to ensure the security of the protectee. This may include utilizing state or local partners to provide specialized functions or otherwise identifying alternatives to reduce public exposure of a protectee."

A source familiar with Secret Service processes told ABC News that the Washington Post story is generally accurate but makes clear that though requests for additional resources were not always fully granted, adjustments were made to accommodate the security needs.

In instances where Trump attended non-campaign events like football games, measures were taken to control his movement in areas that could more effectively be controlled, such as using tunnels and passageways, and Secret Service personnel were posted with hand-held magnetometers to screen people in close proximity to the former president, according to the source.

There were also instances when, if requested Secret Service counter-sniper teams were not available, sniper teams from local law enforcement agencies were used to augment security, the source said.

-ABC News' Jack Date and Pierre Thomas

Rep. Brendan Boyle of Pennsylvania called on Secret Service Director Kimberly Cheatle to resign on Saturday.

Boyle is the first Congressional Democrat to call on Cheatle to resign.

"I am calling on Director Cheatle to resign immediately following last weekend’s shooting of a Presidential candidate in Western Pennsylvania. The evidence coming to light has shown unacceptable operational failures. I have no confidence in the leadership of the United States Secret Service if Director Cheatle chooses to remain in her position," Boyle's statement read.

Boyle is the ranking member of the House Budget Committee.

ABC News' Lauren Peller

Donald Trump's former White House physician, Rep. Ronny Jackson, has been examining the former president since the assassination attempt last week and has stayed by his side during the RNC.

He provided an update on the former president's health in a letter stating Trump is doing "well" and recovering "as expected."

"There was initially significant bleeding, followed by marked swelling of the entire upper ear. The swelling has since resolved, and the wound is beginning to granulate and heal properly. Based on the highly vascular nature of the ear, there is still intermittent bleeding requiring a dressing to be in place. Given the broad and blunt nature of the wound itself, no sutures were required," Jackson said.

Jackson added the bullet came less than a quarter of an inch from entering Trump's head, producing a "2 cm wide wound that extended down to the cartilaginous surface of the ear."

Trump had a precautionary CT scan while in Butler, according to Jackson.

-ABC News' Lalee Ibssa, Soorin Kim and Stephanie Wash