Georgia GOP senator resigning from Congress at the end of the year

On Wednesday, Sen. Johnny Isakson (R-GA) announced he is resigning from the Senate at the end of 2019, citing his worsening Parkinson's Disease:

The senior senator from Georgia, Isakson's political career has spanned four decades.

With his resignation, GOP Gov. Brian Kemp will appoint a temporary replacement. A special election in 2020 will be held to decide who will serve out the remainder of Isakson's term until 2022.

Georgia's other senator, Republican David Perdue, will face a regularly scheduled election at the same time.