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A leading voice in conservative radio who helped promoted the Republican political agenda in Wisconsin but was outspoken in opposing Donald Trump, retired from his popular radio show Monday.

Milwaukee talk radio host Charlie Sykes said his decision to end a 23-year run at WTMJ-AM was made before his opposition to Trump garnered national attention.

Sykes, a Republican commentator, author and radio host, embarrassed Trump during an on-air interview before Wisconsin’s primary when Trump admitted not knowing Sykes was a leader in the “#NeverTrump” movement.

Sykes recently told National Public Radio’s Michel Martin that his resistance to Trump drew a level of public vitriol he had never experienced.

“There would be nights when I would appear on a cable show and open up my Twitter feed, and there would be 500, 600, 700 reactions. And to say that, you know, many of them were intense is putting it mildly. ... The level of anger was something not totally unprecedented, but it’s just ... something that I had never seen before,” Sykes said on “All Things Considered.”

U.S. House Speaker Paul Ryan was among those bidding adieu to Sykes Monday on the air. Ryan, from Janesville, credited Sykes with challenging what Ryan called a liberal-leaning media.