Members of Britain’s Conservative Party selected Liz Truss to replace Boris Johnson as the party’s leader on Monday, meaning Truss will take over as the U.K. Prime Minister on Tuesday. The former foreign secretary will officially begin her new job after Johnson visits Queen Elizabeth II to formally resign, writes CBS NEWS.

Liz Truss will be Britain’s third female prime minister.

A longtime Conservative politician, Truss was the U.K.’s first female Lord Chancellor, the cabinet member in charge of the courts. She has also served as the education minister, the environment minister, justice secretary, and most recently, as the foreign minister under Boris Johnson. She also took a lead role in Britain’s support for Ukraine amid Russia’s ongoing invasion.

Despite being less popular with Conservative members of parliament than her rival, she landed the country’s top job by polling better among the Conservative party’s registered members across Britain.