Hillary Clinton's campaign is standing by top aide Huma Abedin as the FBI investigates emails found on a laptop she shared with estranged husband Anthony Weiner.

Campaign Manager Robby Mook said on NBC's "Meet the Press" Sunday that he is "absolutely" confident that Abedin has fully complied with the agency during its previous probe into Clinton's homebrew email server.

Mook noted that FBI Director James Comey did not say in his letter to Congress Friday whose emails the agency is now investigating. He said the onus of releasing the newly-discovered emails lies with the FBI.

Also on NBC, Republican vice presidential candidate Mike Pence asked why Clinton wouldn't release Abedin's emails.

Abedin told lawyers in June in a deposition that she never deleted old emails on her devices.