Is any of this legal and proper?

President Donald Trump asserts he can withhold money that Congress has allocated, deport migrants without going through immigration courts, fire federal workers and tell the Justice Department not to enforce laws that Congress has passed.

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Part of the problem here is that the government has admitted, in a subseqent filing, that they "know very little" about the people they deported. That means that they conceivably could have deported US citizen or green card holders, people who were NOT gang members, and - people who had never been judged guilty of any crimes (this last part applied to most or all of them apparently). None of these people got any due process at all.
Is any of this legal and proper?
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