(People take part in the annual Gay Pride march in Paris, June 30, 2012. The sign at rear reads “Marriage for All”. REUTERS/Mal Langsdon )

Roman Catholic bishops and conservative politicians are stepping their campaign against French President Francois Hollande’s plan to legalize gay marriage days before his government presents its draft law in cabinet.

Paris Cardinal Andre Vingt-Trois is expected to call for a broad mobilization against the law when Catholic bishops meet in the southwestern pilgrimage town of Lourdes for their annual plenary on Saturday.

Far-right National Front leader Marine Le Pen and Jean-Francois Cope, who is campaigning to lead the main opposition UMP party, both backed proposals this week for a large national protest march in defense of traditional marriage.

Protesters took to the streets of 75 cities and towns across France last week and lay Catholic leaders have called for another round of demonstrations in mid-November. Sample letters against the law have been posted on websites sent to elected officials.