They might be in favor of it based on arguments that department B is unnecessary.
I seriously doubt they'd support arguments of eliminating department B on grounds that it's claimed Constitutional authority is flawed if department A claims authority on the same basis.
Necessary. Unnecessary. Whatever. If department B goes, there's more money for department A.
"I seriously doubt they'd support arguments of eliminating department B on grounds that it's claimed Constitutional authority is flawed if department A claims authority on the same basis."
I'm in favor of reducing or eliminating departments even if they're constitutionally sound. Aren't you?
The bottom line is that government employees may favor a reduction in government and/or a reduction in government spending, as long as it's not their department.