South Australian Senator Rex Patrick says he is concerned Centre Alliance colleague and former senator Nick Xenophon has left it too late to successfully return.
Almost five years after he resigned from the Senate amid uncertainty over whether he was a dual citizen, Mr Xenophon last week announced he will stand at the next federal election.
But Senator Patrick told ABC radio he had urged Mr Xenophon to announce his run before Christmas.
"He's entered the race now with his name below the line ... He's got very few volunteers and will likely have very little in the way of donations (and) that makes it really, really hard," he said.
He says if Mr Xenophon is not successful, the seat could be lost to One Nation.
In his own case, Senator Patrick says he has not yet decided whether to run again for the Senate or for the lower house seat of Grey.
"I've got to think long and hard about what I do to make sure I make the right decision - the best decision - for South Australia," he said.
Meanwhile, Liberal candidates for NSW in the upcoming federal election will soon be finalised after the party's federal executive resolved to intervene in selections.
A committee made up of Prime Minister Scott Morrison, NSW Premier Dominic Perrottet and former federal Liberal president Christine McDiven will have control over the NSW branch until Saturday, April 2.
They must select candidates for the seats of Eden-Monaro, Fowler, Grayndler, Greenway, Hughes, McMahon, Newcastle, Parramatta and Warringah by that deadline, in preparation for an election to be called.
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