Employer cutting hrs to avoid paying health insurance.

This seems to be a nation wide issue where our employer has cut hrs to the point where the employer wants to rid staff of health insurance. Most of work the minimum hrs required to work for health is 20 hrs a week for single or 30 for family. Most employers are complaining they are getting like just a little under that for their weekly hrs. Kroger did this little dance when obomacare was passed and provided people with 29.5 hr work weeks. They seem to be going back to this game. Should I call the union over this? Even my hrs have been staggeringly cut from 34 hrs a week to < 20 hrs a week out of the blue. They're quoting summer time reduction but I don't believe it. I feel it's a lie.

I was highly considering calling our union rep.