A member of the Liberal Party's front bench will quit federal politics at the next election.
Opposition home affairs spokesman Jonathon Duniam will not seek re-election for his Tasmanian Senate seat.
The 43-year-old said he wanted to step back from politics after 10 years in federal parliament to spend more time with his family, including his three children.
"This was an extremely difficult decision to make - albeit that it is one I have been considering for quite some time," he said in a statement.
"I have spent the past 25 years in politics, the last 10 of those as a senator for Tasmania - and I have given everything to these responsibilities, often at the expense of family.
"Twenty-five years is a long time in any vocation and, when you take your role seriously, it always comes first.
