European Union foreign policy chief Javier Solana on Tuesday criticized U.S. plans to extend barriers along its border with Mexico, saying immigrants should not be treated like criminals.

“A wall that separates one country from another is not something that I like or that the European Union members like,” Solana said at a news conference in Mexico City. “We don’t think walls are reasonable instruments to stop people from crossing into a country.”

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Mexico has lobbied for comprehensive immigration reform that would let more migrants enter the United States legally.

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