Do non-citizens, say, immigrants, have rights under the Constitution of the USA? Constitution says...... YES!
The due process clause of the 14th Amendment:
No state shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any state deprive any PERSON of life, liberty, or property, without due process of law; nor deny to any PERSON WITHIN ITS JURISDICTION the equal protection of the laws.
And the 5th Amendment:
No PERSON shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a grand jury, except in cases arising in the land or naval forces, or in the militia, when in actual service in time of war or public danger; nor shall any PERSON be subject for the same offense to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use, without just compensation.
A reminder, the definition of "person": a human being regarded as an individual.
synonyms: human being, individual, man/woman, child, human, being
