He and Scott Walker may both be assholes, but they're both right with regard to public sector unions. His proposed changes are exactly what have been in place for Federal sector employees unions for decades. Public sector unions should contribute to the planning of annual picnics and office moves, but little else.
FWIW,
FDR himself was strongly opposed to public sector unions. The unholy alliance that has grown between public sector unions and the Democratic Party results in all sorts of nefarious stuff, mostly huge deferred compensation programs that break the bank after the complicit politician is gone.
The labor movement has lost so much representation in the private sector that they now must rely upon public sector unions to undergird the foundering labor movement. That's not what public sector employees should be doing.