[jQuery] How to access TableSorter configuration properties

I'm using the TableSorter plugin on a table that will have new rows
appended to it by AJAX calls. I want to resort the table using the
current sort settings after new rows are added.
I am using the TableSorter .trigger("update") and .trigger("sorton",
[sorting]) methods to resort the table. I need to access the
tablesorter config object to extract the SortList. How can I do this?
Thanks,
Carl