OTTAWA — Prime Minister Justin Trudeau of Canada has a simple strategy for winning re-election: Ignore the plummeting polls, defend his record and push back against detractors.

Despite months of criticism over his handling of a corporate criminal case and treatment of a female cabinet minister — and continuing pressure over his environmental and energy policies — he is not paring back or changing course.

“I feel I’ve been true to the values that I hold to, the way I try to look at things,” he said in a recent interview in his newly renovated parliamentary office. “I’m under no illusions that if you actually want to do things, there are going to be people in agreement and disagreement with you on everything.”

But a lot of Canadians are disagreeing with him these days, as he has tried to navigate between his ambitious social priorities and economic pragmatism.