Georgia Gov. Brian Kemp on Wednesday appointed Atlanta businesswoman Kelly Loeffler to take over the seat of retiring Sen. Johnny Isakson.

Kemp, a Republican, had been pressed by President Donald Trump to appoint Rep. Doug Collins, CNN previously reported, but selected Loeffler in a rare act of defiance against Trump by a member of his own party.

Isakson is retiring on December 31 due to health concerns.