Gender pay-gap of the magnitude you're talking about is a myth in 2019. Kamala Harris mercilessly preys upon the ignorance of her constituent base.
Men as a group do earn more than women 'on average', but not that much more when they work the same job and they have similar experience and abilities.
(a) job choice, and
(b) job experience (i.e. time in job).
Men and women gravitate toward different careers.
Common jobs for men: Software Developer, Project Manager, Computer Systems Administrator
Common jobs for women: Registered Nurse, Elementary School Teacher, Human Resources Administrator
The first set of jobs on average pay much higher to -- both men and women.
The End