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The decision comes after Republican Sen. Jon Kyl, who had been a temporary replacement after John McCain's death in August, announced last week he would step down at the end of the year.
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Kyl previously retired from the Senate in 2013 and indicated his return would be temporary after Sen. John McCain's death. Arizona Gov. Doug Ducey will appoint a replacement to serve until 2020.
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The 76-year-old Kyl, who served three terms in the Senate before retiring in 2013, has been helping guide Brett Kavanaugh through the Supreme Court nomination process in the Senate.