At Democrat presidential candidate Robert “Beto” O’Rourke’s immigration rally in El Paso in February, more than a few people noticed there were more Mexican flags in the crowd than American flags.

Recent analysis of O’Rourke’s social media advertising may help explain why.

Ad targeting data provided by Facebook shows O’Rourke intentionally targets supporters in Mexico, going as far as inviting them to events in the United States, according to the Washington Free Beacon.

O’Rourke is holding a town hall at the Jacobs Center for Neighborhood Innovation in San Diego today, for example, and the Facebook data showed he invited his friends in Mexico to attend.

“The O’Rourke campaign did not respond to a request for comment on the Mexican advertising,” according to the Free Beacon, which conducted the ad analysis on Friday. “A Monday review of his campaign’s Facebook page found it was no longer advertising in Mexico.”

The ads targeted to folks in Mexico certainly make sense, as many would undoubtedly support O’Rourke’s open borders advocacy if or when they become U.S. voters. O’Rourke held a counter rally against President Trump in El Paso in February. Unlike the barrage of American flags at Trump’s rally of about 20,000, O’Rourke drew a few hundred, many waiving Mexican flags.

Ironically, O’Rourke told his followers in El Paso that “walls do not save lives, walls end lives” from behind a fenced barrier used to keep the masses at bay. Others noted that the Mexican flag at the event was much larger than the American flag, which was also relegated to a lower post.

“Not only is the Mexican flag present, it is larger than the American flag, and – in a complete violation of flag etiquette – the Mexican flag is actually higher than the American flag,” one Twitter user pointed out, providing a picture as evidence.

Regardless, “it is unclear why O’Rourke is running ads in Mexico for his campaign to be president of the United States,” the Free Beacon reports. “There is a Democrats Abroad primary that will be held next March, but O’Rourke has made no mention of it thus far on the campaign trail.

“A review of the Facebook pages for each of O’Rourke’s Democratic opponents for the presidential nomination found that none were running ads targeting anybody outside the United States.”

President Trump is the only other person running in 2020 to target ads beyond the U.S., with Facebook ads going to residents of Puerto Rico.

O’Rourke’s messages to Facebook users in Mexico isn’t the first time his campaign has faced criticism for putting more effort toward courting illegal immigrants than the folks he wants to represent.

Less than a week before O’Rourke’s embarrassing defeat in the 2018 midterms, conservative activist James O’Keefe published an undercover video from within the O’Rourke campaign showing staffers explain how they funneled campaign funds to support the migrant caravan.

The video forced O’Rourke’s campaign to acknowledge the financial support for illegal immigrants, something that could be illegal depending on the circumstances of the transaction, Snopes.com reports.