Feingold criticizes Johnson for 'sunspot' remark

MILWAUKEE (AP) - Sen. Russ Feingold is criticizing his likely GOP challenger's views on climate change.

Feingold's comments Monday came after Oshkosh businessman Ron Johnson said the science of human-caused climate change hasn't been proven. Johnson says climate change might be due to sunspots.

Feingold told reporters at the Milwaukee Press Club that Johnson's explanation is "not credible." Feingold says Johnson is distorting the problem with unscientific claims.

Sara Sendek is a spokeswoman for Johnson's campaign. She says his point was that he doesn't want to rush into economically damaging legislation while there's still uncertainty over the cause of climate change.

Johnson, Watertown businessman Dave Westlake and Milwaukee plumber Stephen Finn square off in the Republican primary Sept. 14.