MONTREAL — The Parti Québécois says it would lean on robots and automation to replace temporary workers as part of a lengthy proposal to slash immigration to Quebec, claiming its plan is a necessary course correction to ease housing pressure and protect the French language.

On Monday, the sovereigntist opposition party, which has only four members in the legislature but is leading in the polls, released a 97-page policy paper outlining major cuts to the province’s immigration levels. It includes a proposal to reduce the number of non-permanent residents in the province to as few as 250,000, down from 600,000 today, within four years of forming government.