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PHOENIX — An Arizona congressman said Friday that President Donald Trump is “mentally unstable.”

“I do believe the president is mentally unstable,” U.S. Rep. Ruben Gallego (D-Ariz.) told KTAR News 92.3 FM’s Mac & Gaydos.

Gallego — who said he plans to fight Trump’s policies until he releases his tax returns — said other Republican presidents would likely be easier to work with than Trump, but there is something different about the new president.

“This man is not normal. He is not acting normal and there is nothing at this point that he has done for me that has proven that I should work with him and I don’t think that’s going to change,” he said.

Gallego repeated his tax release demands several times, but also gave a long list of issues he has with the president.

“I will not work with President Trump because President Trump has not been clear and transparent with what happened during this election,” he said. “I will not work with him on an infrastructure bill until he releases his taxes, his disclosure to make sure that he’s not starting a hypocrisy. He should not try to stop or impede an investigation into Russian interference in this election.

“There’s a lot of things that are wrong with this president.”

Gallego was also highly critical of Trump’s plan to build a wall on the U.S.-Mexico border.

“The border wall is just basically a way for him to actually feed his base of voters because, at the end of the day, it makes zero difference,” he said.

While Gallego said Congress had a plan to introduce an expanded border wall in a comprehensive immigration bill a few years ago, he said the way in which Trump has pushed for his wall is dangerous.

“I see the motivation behind it as a symbol of racism. He wants to scare the white people about the brown people,” Gallego said, adding that Trump is “stoking up one of the worst segments of the United States in terms of some deep-seated racism toward people that are Latino.”