This came after Minoru Terada was sacked by Kishida earlier in the day amid mounting pressure over a funding scandal and declining support for his cabinet.
The replacement will be formally announced on Monday morning, according to local media.
Matsumoto, now 63 and a lawmaker for the ruling Liberal Democratic Party (LDP), served as foreign minister in 2011.
Terada, who submitted his resignation on Sunday, is alleged to have “falsely reported” expenses to the tune of 1 million yen (about US$7,000) related to last year’s lower house elections, with the bill paid by one from their support groups. .
Citing a legal expert, an online article in the weekly Shukan Bunshun magazine said Terada’s report on his election campaign spending violated Japan’s public office election law.
The scandal-hit Terada’s departure is a new blow for the prime minister, as he was the third cabinet member to leave in less than a month, following the resignation of two other ministers due to mistakes or close ties to the Unification Church. ■