On 27 September 2018 he announced in a televised press conference that he and some other leaders had begun what he called the New Formation which later became the ANT.

[4] He had an affluent childhood as his father was a strong government functionary and close friend of Ugandan leader Milton Obote.

Muntu joined the guerrilla National Resistance Army of Yoweri Museveni the day he completed his university exams, to the chagrin of his family and President Obote, who considered him a son.

[6] Muntu underwent further elite military training in Russia before becoming a division commander in Northern Uganda.

Observers have attributed Maj. Gen. Muntu's quick ascension to the pinnacle of the NRA/UPDF to his reputation as an incorruptible and loyal officer to the President of Uganda.

Muntu was accused of creating a schism within the army by showing preferential treatment to educated officers while sidelining those he considered uneducated.

[8] On 21 November 2020, Muntu, along with fellow opposition presidential candidates Bobi Wine, Henry Tumukunde, Norbert Mao, and Patrick Amuriat Oboi, agreed to form an alliance together.