Scott Morrison has put the economy at the centre of his pitch to voters, saying they need to keep him as prime minister because "now is not the time to turn back" to Labor, after he announced a May 18 date for the federal election.

Scott Morrison has put the economy at the centre of his pitch to voters, saying they need to keep him as prime minister because "now is not the time to turn back" to Labor, after he announced a May 18 date for the federal election.