Gov. Tony Evers ordered a special election Friday to fill an open Assembly seat representing Milwaukee's northern suburbs.

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Wisconsin Governor Tony Evers

Democratic Wisconsin Gov. Tony Evers on Friday called for a special election to fill Republican state Sen. Dan Knodl's old assembly seat. (AP Photo/Andy Manis, File)

Republican Dan Knodl represented the 24th Assembly District from 2009 until last month, when he won a special election to fill a state Senate seat left vacant after longtime Republican incumbent Alberta Darling retired in November.

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Evers issued an executive order setting a special election for Knodl's seat on July 18, with a primary set for June 20 if necessary. Candidates could begin circulating nomination papers Friday. They must turn them in to the state elections commission by May 23.