Apparently, Scott Walker isn't sure what to think about Donald Trump

(emphasis added)

Quoted in Scott Walker on Donald Trump's first 100 days: 'Actions speak louder than words'.  (Madison.com, 4/25/2017)

Memo to Scott:  A promise, as defined by Merriam-Webster, is a declaration that one will do or refrain from doing something specified.  It's just a bunch of words, not an action.

And this guy's supposed to be 'bulletproof'?