In 2006, Jensen lost his preselection for Tangney for the 2007 federal election, but won it back with the support of the state executive and prime minister John Howard.

[citation needed] Jensen rejects the scientific consensus on human-induced global warming and, on behalf of the Lavoisier Group, organised the release of a book[6] entitled Nine Facts About Climate Change by former mining CEO Ray Evans.

In February 2007 during a Parliamentary sitting, Jensen quoted the then IPCC vice chairman Yuri Izrael, who had stated that "there is no proven link between human activity and global warming".

It was revealed he had written a technothriller, falsely portrayed as a work of erotic fiction, named "The Skywarriors" in which Indonesia invades Australia.

In August 2017, Jensen sent an email to former Liberal colleagues, saying he had joined the Australian Conservatives party started by Cory Bernardi, and urging them to follow him.