Prime Minister Kim Min-seok delivers opening remarks at a plenary meeting of the National Climate Response Committee at the Government Complex Seoul annex in Jongno District, central Seoul, on May 29. [NEWS1]

Prime Minister Kim Min-seok is preparing to offer his resignation after this week's local elections, as he plans to run for the leadership of the ruling Democratic Party (DP), news reports said on Monday.

Kim plans to express his intention to resign to President Lee Jae Myung after Wednesday's local elections to run for party leader, which will be determined at the DP's national convention in August, according to the Kyunghyang Shinmun and other media outlets.

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But Kim is expected to remain in office until his successor is ready to take over, the reports added.