BREAKING: The US Marines have detained a US citizen in Los Angeles. This is the first time in known US history that the marines have been used in this way to detain an American without the Insurrection Act being invoked.
The Posse Comitatus Act (1878) Prohibits the use of the U.S. military (Army and Air Force, and by extension Navy and Marines under DoD policy) to enforce domestic laws without explicit Congressional or constitutional authorization.
In other words, Trump is breaking the law once again.