Sunday's contest has implications for the spread of far-right ideology, France's relationship with the rest of Europe and the country's posture toward Russia.
During a stop on his European tour, Bannon told a conference of the far-right National Front party in France, "Let them call you xenophobes. Let them call you nativists. Wear it as a badge of honor."
The French president says that during elections, the law would allow the government to block content deemed to be fake news and would force news websites to disclose their source of funding.
The leader of the far-right National Front party, who made an unsuccessful bid for the French presidency, is alleged to have made fraudulent payments for party work.
Marine Le Pen grew up in a "house of political violence," a biographer says. Since taking control of the far-right party her father founded, she has tried to expand its reach, and kicked him out.
The French presidential candidate is portraying herself as a working mom who fights for women, but says she's no feminist. The populist politician is also known for her anti-immigrant stance.
Among 18- to 24-year-olds, Marine Le Pen is by far the No. 1 candidate, with 40 percent of the vote — a startling shift for a country that's traditionally known for its leftist youth movements.