The Department of Education issued a resource guide on Tuesday that guides teachers on how they should treat undocumented students, and encourages them to boost educational and career opportunities for those students.

"Teachers … who serve immigrant students should understand the cultural and educational backgrounds of their students," the 63-page document recommended. "The development of trusting relationships with educators is especially important for undocumented youth, and affirming attitudes toward students' backgrounds and cultures may help to facilitate greater mutual trust."

The department offered that advice right after a disclaimer saying these guidelines are just that, advice, not a requirement.

"The U.S. Department of Education does not mandate or prescribe practices, models, or other activities in this guide," the agency clarified. "This information … is provided for the reader's convenience and is included here to offer examples of the many resources that educators, parents, advocates, administrators, and other concerned parties may find helpful and use at their discretion."

"The U.S. Department of Education does not control or guarantee the accuracy, relevance, timeliness, or completeness of this outside information," the disclaimer continued.

Then the agency offered pages of more guidance.

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