DHS Secretary Mayorkas is leading a bipartisan investigation into the security failures at the Trump attempted assasination.
https://deepnewz.com/crime/secret-service-under-scrutiny-after-july-13-trump-assassination-attempt-butler

While Secret Service Director Kimberly Cheatle is under the most scrutiny, many are also critical of Mayorkas. With leaked documents about Trump being denied extra security, among other things.

Will Mayorkas resign or be forced to step down before the election?

The market will resolve YES or NO according to widespread media reports.