Resignation will be sent after PM Modi returns from the US, Uddhav Thackeray said.
Shiv Sena chief Uddhav Thackeray has said he is pulling out his party's only minister in the BJP-led Narendra Modi government at the Centre, after the two parties split last week over seat sharing in Maharashtra, where assembly elections will be held in two weeks.
Anant Geete, who holds the heavy industries portfolio in the Union cabinet, will resign when Prime Minister Modi returns from his US trip on October 1, he said.
Uddhav's announcement comes after his cousin and Maharashtra Navnirman Sena chief Raj Thackeray publicly chided him over Mr Geete continuing as an NDA minister.
At an election rally on Sunday, Raj attacked the BJP for ending its 25-year-old alliance with the Sena and said his cousin should ask Mr Geete to resign as a "mark of protest against the insult".
Had Sena founder and Uddhav's father Bal Thackeray been alive, he would have ended the association a month ago, Raj declared, accusing the BJP of having planned the split.
The estranged cousins had spoken a couple of times after the BJP called off the alliance, raising speculations about a rapprochement. But sources close to Uddhav had said the calls were made since Raj was ill and had been purely personal.
The Sena is expected to withdraw from the BJP-led National Democratic Alliance at the Centre. It is the NDA's second biggest constituent with 18 members in the Lok Sabha and its pulling out will bring down the alliance's numbers in the house from 336 to 318.
After winning 41 of the state's 48 Lok Sabha seats in May, the BJP-Sena combine was hoping to unseat the Congress-NCP alliance, which had been in power in the state for 15 years.
But the BJP broke up with the Sena last week after two parties failed to agree on how many seats each would contest for the national elections. Less than an hour later, the rival alliance of the Congress and NCP split too. All the parties are now contesting separately in four-cornered contest, with Raj Thackeray's MNS being described as the joker in the pack.
The Sena is contesting all 288 assembly seats; the BJP is contesting 257, conceding 31 seats to the smaller allies.