Becerra, who served 12 terms as a lawmaker in the U.S. House, panned what he called the president's "extravagant obsession" to construct a border wall "that not even the experts want." He also asked how a country can be strong while it's under "disorder, stress and hostility."

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Since becoming attorney general, Becerra has sued the Trump administration 45 times — more than any state attorney general has sued a presidential administration.

"In the courts and in Congress, we have to fight for our agenda," Becerra said Tuesday night. "That is why I have fought as the California attorney general in court against the administration, and we are winning."

Democrats would reject any "foolish proposal" to channel emergency funds to construct a border wall, Becerra said.

"The idea of declaring a nonexistent state of emergency on the border, in order to justify robbing funds that belong to the victims of fires, floods, hurricanes and droughts, to pay for the wall is not only immoral, it is illegal," he said.

Becerra called on more Hispanic voters to participate in upcoming elections, after Latino voters helped Democrats win back the House in the 2018 midterm elections.

"Believe me, we can tear down walls and open doors with our hands, what's more, we already have," he said. "With your votes last November, you changed the composition of Congress."

Thanks to those voters, Becerra said, Trump "now has to learn to govern in a democracy." He added that Hispanic voters are the reason the president's proposed border wall hasn't been built.