Could Trump actually declare war on Mexico to resolve the illegal alien "attack" on the USA?

lets just say these court judges and whoever in Congress or Senate keep messing up his plans to do something about the MILLIONS of illegal aliens in the usa....could he just declare war on Mexico and get the US military involved in rounding up all the illegal aliens and THEN also have reason to build the wall to... show more lets just say these court judges and whoever in Congress or Senate keep messing up his plans to do something about the MILLIONS of illegal aliens in the usa....could he just declare war on Mexico and get the US military involved in rounding up all the illegal aliens and THEN also have reason to build the wall to keep them out?

what the American people would think?
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