MP Ingrida Šimonytė has agreed to head the list of the Homeland Union – Lithuanian Christian Democrats (TS–LKD) in the next parliamentary election in October.
The conservative TS-LKD is the largest opposition party and topped the popularity rankings in February.
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"I am glad that Šimonytė accepted the invitation," said Gabrielius Landsbergis, the party's chairman. "Her experience, competence and the highest standards of transparency and ethics are a big asset for the state as a whole."
"In times of crises, populism, and apathy, we need politicians who are competent, speak clearly and, most importantly, strictly adhere to values to help restore confidence in the state," he added.
Landsbergis hopes that Šimonytė's decision "will encourage other people who have achieved a great deal in their professional fields to step into political life and choose to work for the state".
"Lithuania deserves normal and responsible politics oriented towards solving real, genuine, long-standing problems of society and the state," he said.
The 45-year-old former finance minister ran for Lithuanian president last year, but lost out against Gitanas Nausėda in the runoff.