CALGARY, Alberta — Jason Kenney may have quit national politics to lead the Conservatives in his native Alberta, but that hasn’t stopped him from consistently bringing up an old nemesis from his days in Parliament as he campaigns in the oil-rich province.

After roaring up to a group of oil storage tanks in Valleyview, Alberta, in his Ram 1500 pickup truck on Saturday, Mr. Kenney told a crowd that the oil industry’s prolonged slump was the fault of “a leader who says he wants to phase out the oil sands.”

“You know who that leader is — Justin Trudeau,” Mr. Kenney said. His supporters jeered at the prime minster’s name.

Alberta is holding its provincial election on Tuesday, and for the past month Mr. Kenney, the leader of the United Conservative Party, has tried to turn the vote into a referendum on Prime Minister Trudeau’s carbon tax. He has slammed Mr. Trudeau for not reversing an oil industry slump that has cost the province thousands of jobs over the last four years.