Plamondon was re-elected without difficulty in the 1988 federal election, as the Progressive Conservatives won a second majority government across the country. Over the following year, he became even more strongly aligned with the Quebec nationalist wing of his party. He supported Quebec premier Robert Bourassa's use of the Canadian constitution's notwithstanding clause to prohibit outdoor English-language signs, and expressed regret that the ban was not extended to indoor signs. He also criticized D'Iberville Fortier, Canada's official languages commissioner, for suggesting that Quebec was acting in an unjust manner toward its anglophone minority.