A longtime director of the Anti-Defamation League called it a fascist gesture. Video provided by Newsy Newslook

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WASHINGTON — Foreign politicians are responding to Donald Trump's unvarnished world views with equally undiplomatic candor.
Some of his many detractors have compared him to Adolf Hitler, while a small group admires his blunt views and forceful personality.
Among the foreign politicians who have spoken out about the Republican presidential front-runner, only Russian President Vladimir Putin and far right-wing politicians who share Trump's anti-immigrant and anti-Muslim views have praised him.
Mexican President Enrique Peña Nieto delivered one of the harshest rebukes Monday, telling the Excelsior newspaper that Trump's "strident tone" is reminiscent of dictators Benito Mussolini and Hitler.
"There have been episodes in the history of humanity, unfortunately, where these expressions, this strident rhetoric has only really been (a) very fateful stage in the history of mankind," he said.
Peña and other Mexican politicians are furious over Trump's vow to build a wall to keep Mexican migrants out of the United States — and make Mexico pay for it.
"I'm not going to pay for that (expletive) wall," former Mexican president Vicente Fox told Fusion's Jorge Ramos last month.
Clearly, the possibility of a Trump presidency has provoked "a feeling of desperation" in Mexico, said Bill Richardson, former U.S. ambassador to the United Nations.
It's not just Mexico worried about the prospect of a Trump presidency, said Richardson, former governor of New Mexico and candidate for the Democratic presidential nomination.
Trump's promise to “Make America Great Again” represents an isolationist policy that reflects the frustration of many American voters, but it is a viewpoint that worries world leaders, Richardson told USA TODAY.
“The world laments that because despite our faults the world wants us to lead," Richardson said.
Photos: Trump through the years