[3] During this term he served as Chair of the Finance Committee and sat as a member of the Parks and Recreation Commission and the Library Board.
[6][7] McCallum ran again for a fourth term in the 2005 municipal elections but was soundly defeated by his emergent rival, Dianne Watts, a former fellow member of his party, the Surrey Electors Team.
[8] McCallum then sought the Conservative Party nomination for the 2006 Canadian election in the riding on Newton—North Delta, after the incumbent Gurmant Grewal stepped down.
Part of his Safe Surrey Coalition campaign included resistance to the city's renovating Newton Athletic Park to recruit the USL Pro team of the Vancouver Whitecaps FC.
[13] In 2018, McCallum sought to get elected after previous Surrey Mayor, Linda Hepner, said that she wouldn't seek re-election.
[21] On December 12, 2021, McCallum was charged with public mischief because of a parking altercation with people against the Surrey Police Department in which he accused a woman driving a Ford Mustang of rolling over his foot.