At the 2008 election, Seselja received a quota of 1.49 and was elected first in the seven-member Molonglo electorate. There was a decrease in the vote for both major parties, with a swing to the Greens. Labor won 7 seats, the Liberals won 6 seats, while the Greens won 4 seats, giving them the balance of power. Negotiations ensued between the Greens and both major parties over the formation of a government. After almost two weeks of deliberations, the Greens chose to support a minority Labor government, thereby consigning Seselja's party to the opposition benches. At the 2012 election, Seselja moved to the five member Brindabella electorate where he received a quota of 1.8. He led the Canberra Liberals to their highest-ever number of seats, claiming eight in the seventeen-member ACT Legislative Assembly.
Federal politics
On 4 February 2013, Seselja stated he would challenge incumbent Senator Gary Humphries for Liberal Party pre-selection for the Senate in the 2013 Australian federal election. Seselja stated he would stand down from leadership of the party in the Legislative Assembly as of Monday 11 February. On 23 February 2013, Seselja won his pre-selection bid, and thus became one of the two official Liberal Party Senate candidates for the ACT. Seselja was elected Senator for the Australian Capital Territory at the 2013 federal election. In 2014, his former opponent Katy Gallagher resigned as ACT Chief Minister to become the ALP Senator from the ACT. With the ACT having two Senate seats, the ACT is represented in the Senate by the two former territory leaders. During the 2016 Turnbull government second ministerial reshuffle Seselja was appointed as the Assistant Minister for Social Services and Multicultural Affairs. In December 2017 as part of a subsequent rearrangement of the Turnbull ministry, Seselja was appointed as the Assistant Minister for Science, Jobs and Innovation. In August 2018, he resigned from the Turnbull ministry as part of the failed attempt to have Peter Dutton replace Malcolm Turnbull as leader of the Liberal Party and Prime Minister. When Scott Morrison succeeded Turnbull as prime minister in August 2018, Seselja was appointed Assistant Minister for Treasury and Finance. His portfolio was changed to Assistant Minister for Finance, Charities and Electoral Matters in May 2019 following the 2019 federal election.
Political views
Seselja's political views have been described as conservative and aligned with the views of former Prime Minister Tony Abbott, although he is a republican. He opposes same-sex marriage, supports cutting penalty rates, and opposes assisted suicide. Seselja abstained from the Senate vote on same-sex marriage in November 2017, despite having promised to honour the national postal result three months earlier. On 15 August 2018, he voted 'no' to the Restoring Territory Rights Bill 2015, which would have restored to the Australian Capital Territory Legislative Assembly the authority to legislate on the matter of voluntary assisted dying.
