BUENOS AIRES, Argentina — The support expressed by Israeli Prime Minister Benjamin Netanyahu in January for President Donald Trump wanting to build a wall separating the United States and Mexico has triggered an “alarming” wave of anti-Semitism online, according to an Argentine Jewish watchdog.

A report by the Argentine Observatorio Web released earlier this week analyzed comments in 22 online articles from the major Mexican newspapers El Universal, Excelsior and Milenio and concluded that nearly 40 percent of the comments were anti-Semitic. The most recurrent themes were the vindication of Adolf Hitler, the representation of Jews as avaricious, greedy, usurers and guided purely by economic interest.

Some 35 percent of the comments were negative about the Israeli government but without anti-Semitic expression, according to the report.

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“This particular case is one of the first times where we see that the criticism is directed towards” Netanyahu, Ariel Seidler, director of the Observatorio Web, told JTA.

The Observatorio Web is a cooperative project of the Argentine Jewish political umbrella, DAIA; the Latin American Jewish Congress, and the AMIA Jewish center of Buenos Aires.

In late January, Netanyahu said on Twitter that “President Trump is right” in response to a tweet on Trump’s campaign promise to build the border wall to prevent illegal immigration.