The political lie/twist to this: he grants amnesty so there is no such thing as an illegal.....
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United States Constitution, Article II, Section II:
” ... he shall have Power to Grant Reprieves and Pardons for Offenses against the United States ...”
He can pardon the offense, but NOT grant amnesty - NOT in the Constitution ...
Not having the authority hasn’t stopped him from doing several things so far, now has it?