The UAW's lead negotiator in contract talks with General Motors on Wednesday issued a scathing assessment of former President Donald Trump hours before Trump was due to speak in Detroit.

UAW Vice President for General Motors Mike Booth sent the Detroit Free Press a profanity-laden email about his thoughts on Trump's trip to Michigan.

"Let me be blunt. Donald Trump is coming off as a pompous (expletive)asshole," Booth said in an email. "Coming to Michigan to speak at a nonunion employer and pretending it has anything to do with our fight at the Big Three is just more verbal diarrhea from the former president."