The race to replace Malcolm Turnbull in Parliament has widened to include two more candidates, with Liberal councillor Mary-Lou Jarvis and local surgeon Michael Feneley entering the contest.

The moves come as Christine Forster, the City of Sydney councillor and sister of former prime minister Tony Abbott, withdraws from the contest because her run might be seen as a “proxy for division” in the Liberal Party.

Eyes on the prize: Liberal preselection candidates for Wentworth, Andrew Bragg (left), Dave Sharma and Mary-Lou Jarvis.

Labor is ramping up its campaign for the blue-ribbon seat of Wentworth in eastern Sydney with its candidate, investment analyst Tim Murray, gaining vocal support from Mr Turnbull’s son, Alex.

The Labor campaign urges voters to use the impending byelection in Wentworth to end the Morrison government’s majority in Federal Parliament and force an election, raising the stakes for the Liberal Party in a seat it won easily under Mr Turnbull.