The president of the European Jewish Congress lamented on Monday the success of far-right candidate Marine Le Pen in the first round of the French presidential elections.

Speaking on Holocaust Remembrance Day, Moshe Kantor described Le Pen as "dangerous" and added that it was "extremely regrettable that more than one in five French voters voted for Le Pen."

With 21.53 percent of the vote, Le Pen trailed slightly behind rival Emmanuel Macron, who got 23.75 percent on Sunday night.

Kantor highlighted that the 48-year-old National Front leader recently "made comments against the historic record of the Holocaust which makes her no less dangerous than her Holocaust-denying father who she has tried to hide."

Earlier this month, Le Pen denied that France was responsible for rounding up more than 13,000 Jews at a Paris cycle track to be sent to Nazi death camps during the Holocaust.

Kantor's comments came after Le Pen launched a scathing attack against Macron earlier on Monday, calling him "weak" in the face of Islamist terrorism.

"I'm on the ground to meet the French people to draw their attention to important subjects, including Islamist terrorism, a topic about which we can say, at the least, that Mr. Macron is weak on," Le Pen told reporters.

"Mr. Macron has no project to protect the French people in the face of Islamist dangers," she said, adding that the run-off with Macron was a referendum on "uncontrolled globalization."