There's none: the audit log is a text-file which can be deleted. However if auditd is configured to run from the initial boot-up, auditd cannot be stopped, and will continue writing to its open file-descriptor. That would record the deletion if auditd were configured to watch its output log (though you'd have to recover the file to see the information).
Normally (on end-user systems), auditd is configured to record "security events" (login/logout), but can be told to watch files for changes. There's nothing specific to (for example) `/var/log/audit/auditd.log`, but you can establish a _watch_ for it as documented in the manual page.
Further reading:
* Linux audit files to see who made changes to a file