A senior party source says Mundine ‘made it very difficult for himself’ in race to succeed retiring NSW senator Marise Payne

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Leading no campaigner Warren Mundine’s support for treaties with First Nations people and moving the date of Australia Day will likely sink his chances of taking a vacant Liberal Senate seat, party sources have said.

Mundine has been touted as a possible candidate for the NSW vacancy created by Marise Payne’s resignation. He has been supported by former prime minister Scott Morrison and his centre-right factional ally Alex Hawke.