ICE is clearly in violation of US law.
While you can establish rules and laws for immigration, immigration itself can NEVER be criminal since it does not violate the rights of anyone else.
And since the US was created by European immigrants who murdered and stole the land from the natives, US immigration law clearly is contradictory and invalid.
Read the treaties, both with the natives and Mexico, and you will find that blocking the borders is illegal.
For example, the Treaty of Guadelupe Hidalgo said that the Spanish Land Grants had to be honored, and that all the Mexican land owners could stay, without becoming US citizens. And the travel of them and their migrant agricultural employees could not be interfered with.
So clearly it is ICE who is in violation of the law and should be arrested.