Scott Brison is set to resign from Prime Minister Justin Trudeau's cabinet after deciding he won't seek re-election this fall. The Treasury Board president has represented the Nova Scotia riding of Kings-Hants for 22 years — initially as a Progressive Conservative MP before jumping to the Liberals in 2003. Brison says he's not sure whether he'll resign his seat altogether before the Oct. 21 election but he will be resigning soon from the cabinet. Brison made history as Canada's first openly gay federal cabinet minister and again as the first federal politician to wed his same-sex partner. He says he wants to spend more time with his spouse and their four-year-old twin daughters. Brison's departure will trigger a cabinet shuffle expected next week.