Perhaps, as Christians who are largely the descendants of immigrants ourselves, we can pray for the more recently arrived immigrants among us:
• That those who have entered the country legally would acclimate well, be welcomed heartily by God's people here, and build a prosperous new life spared of having to endure unfounded hostility and suspicion.
• That those who have entered the country illegally would be met with wisely measured degrees of justice and mercy, especially for the sake of their children.

A few Bible verses that seem applicable:
• Jesus said, "The second [greatest commandment] is this: 'You shall love your neighbor as yourself'" (Mark 12:31 ESV).
• "I was a stranger and you welcomed me" (Matthew 25:35).
• "You shall treat the stranger who sojourns with you as the native among you, and you shall love him as yourself, for you were strangers in the land of Egypt: I am the LORD your God" (Lev 19:34).
• "The sojourners who reside among you and have had children among you ... shall be to you as native-born children of Israel. With you they shall be allotted an inheritance among the tribes of Israel. In whatever tribe the sojourner resides, there you shall assign him his inheritance, declares the Lord God" (Ezekiel 47:22-23).