It is not known what the agents' proximity to Trump was on Jan. 6 or what information they may have provided to the grand jury.
Sources told NBC News that about 24 Secret Service agents appeared before the grand jury that considered that case in Washington before the case moved to Florida.
A spokeswoman for the Secret Service declined to comment.
Ornato took a leave of absence from the Secret Service to serve as deputy chief of staff for Trump beginning in 2019 and then returned to the Secret Service when Trump left office.
Both Engel and Ornato have since left the Secret Service and it is not known whether they have testified before the grand jury.
Persons:
Donald Trump, Jack Smith's, Cassidy Hutchinson, Hutchinson, Trump, Bobby Engel, Tony Ornato, Ornato, Engel, Mike Pence
Organizations:
Capitol, NBC News, Secret, Secret Service, Trump, Jan, White, Service, Department of Homeland Security
Locations:
Trump, Florida, Washington