Darline Graham Nordone, Lindsey Graham’s younger sister and close confidant, will serve the remainder of the late senator’s term in Washington.

President Donald Trump and Senate Majority Leader John Thune both publicly expressed support for McMaster choosing Nordone as a tribute to Graham.

Her appointment as an interim caretaker triggers a wide-open race ahead of the Aug. 11 primary. Several Republicans are already weighing bids to take over Graham’s place as the GOP Senate nominee.