Donald Trump's visit to Detroit this weekend was accompanied by the city's mayor accusing the GOP nominee of using its residents, particularly those in the African-American community, as political props.

"This is the most phony major party nominee that I've seen in my lifetime, and that's why we're skeptical," Mayor Mike Duggan, a Democrat, told reporters Saturday. "I feel like I'm watching the next season of 'The Apprentice.'"

Trump stopped Saturday at Detroit's Great Faith International Ministries, where he attended service and promised his predominantly African-American audience that he'd make their communities safer and wealthier.

He didn't offer specifics of his plan to improve the lives of people in minority communities, however, which led to criticism from certain African-Americans — and also Duggan, who is white.

"We want to hear … plans for reducing poverty," the Motor City mayor said, explaining that serious candidates actually outline their proposals.

Duggan is joined in his criticism of the GOP nominee by former MSNBC host Al Sharpton, who said Saturday Trump missed big opportunity to win over black voters.

"I think he really blew a tremendous opportunity to really shut a lot of us up that have been questioning him," he said. "You talk to voters about what you propose they do. You don't say, 'I come 70-years-old having been in the public eye 35 years and I'm just discovering what you need and I have no policies to offer you.'"