The probe's expansion comes as a result of Global News' reporting on Sunday, which saw Maj. Kellie Brennan, one of the women behind the allegations, share her story.

Gen. Jonathan Vance denies the allegations of inappropriate behaviour and says he has been a "champion" and "friend" to Maj. Kellie Brennan.

Harjit Sajjan will be among five top-level witnesses testifying about allegations of inappropriate behaviour by former chief of defence staff Gen. Jonathan Vance.

It comes after exclusive reporting by Global News into allegations that former chief of defence staff Gen. Jonathan Vance engaged in inappropriate behaviour.