Story highlights Conservative talk radio show hosts blasted Donald Trump ahead of the Wisconsin primary

Badger State voters picked Texas Sen. Ted Cruz in the Republican contest

(CNN) One of the strong forces Donald Trump faced in Wisconsin's Republican primary, a contest he lost to Sen. Ted Cruz on Tuesday, was a group of conservative talk radio show hosts who roundly criticized him.

After several contentious interviews -- including one with Charlie Sykes , a leader of the "Never Trump" movement -- Trump lashed out.

The billionaire businessman criticized them for three days in a row -- in rallies Saturday and Monday and talking to reporters Sunday.

"This morning I was interviewed by a very good radio guy -- not the whack job that interviewed me -- his name is Sykes? ... Oh he is the worst," Trump said at a rally in Rothschild on Saturday.

When Trump called into Sykes' show last week, he was pressed on the tone of the campaign and his re-tweeting of an unflattering photo of Cruz's wife, Heidi

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