capitol riot. the focus of tonight s hearing, those critical 187 minutes during the riot when trump refused to take any action to call off that mob. more now from cnn s ryan nobles in washington. reporter: one text exchange is the sum total of what the secret service handed over to the january 6 committee leaving more questions about what the agency is up to. we re trying to determine where the texts are and whether they can be recovered. reporter: the secret service says their agents don t texas p job. messages that the dhs inspector general believes were deleted during a dwight upgrade program. there is a lot more questions to answer. but we have a responsibility to tell the truth and to chase the facts and that is what we man do in this regard as well as our general oversight over the executive department. reporter: meanwhile secret service has started complying with the committee subpoena handing over thousands of documents, including radio traffic and emails.
in this regard as well as our general oversight over the executive department. reporter: meanwhile secret service has started complying with the committee subpoena handing over thousands of documents, including radio traffic and emails. we also need to find out what technologically is possible to recover all of the communications between the secret service and others on the 5th and 6th in particular but not just those days. reporter: as the agency faces a credibility crisis, homeland security secretary alejandro mayorkas promised that they would comply with the investigation. the secret service remains committed to cooperating fully with the committee. migration was planned well before january 2021. reporter: the secret service and what they witnessed on january 6 could be a key part of what the committee hopes to uncover in their primetime hearing.