Surapong is set to submit his resignation to the party leader at the Pheu Thai headquarters and hold a press conference on Thursday.

Surapong was impeached by the National Legislative Assembly (NLA) late last month for malfeasance over the reissue of revoked passports to former prime minister Thaksin Shinawatra. Following the impeachment, Surapong stands banned from politics for five years.

The former foreign minister was accused of illegally returning the two Thai passports to Thaksin, who has been living in exile. Thaksin was convicted for violating conflict of interest rules for allowing his wife to buy land from a state agency during his term as premier.