Democrats are targeting Donald Trump in their convention speeches, and the Republican presidential nominee is getting tired of it.

He says he wanted to ‘‘hit’’ some of them ‘‘so hard their heads would spin.’’

Trump isn’t identifying any of them. But he tells a crowd in Iowa that one certain speaker — Trump describes him as ‘‘a little guy’’ who he used to work with — particularly bothered him.

Might that be former New York City Mayor Michael Bloomberg? He had some dealings with Trump — a New York real estate developer — as the city’s leader.

By the way, Bloomberg is listed as 5-foot-8 inches.