Federal government cannot deploy federal troops domestically for high crimes in US city.

The claim that the federal government cannot deploy federal troops domestically for high crimes in a U.S. City is largely accurate but requires important legal context and nuance. The Posse Comitatus Act (PCA) is a foundational statute that generally prohibits the use of federal military personnel in civilian law enforcement roles within the United States.brennancenter.orgbrennancenter.orgThe Posse Comitatus Act Explained This means that, under normal circumstances, federal troops cannot be used to enforce criminal laws or respond to crimes in cities.

However, there are statutory exceptions to this prohibition, most notably the Insurrection Act. The Insurrection Act allows the President to deploy federal troops domestically to suppress insurrections, domestic violence, unlawful combinations, or conspiracies that obstruct the execution of federal laws or endanger public safety.lawfaremedia.orglawfaremedia.orgHow the Insurrection Act (Properly Understood) Limits Domestic Deployments of...brennancenter.orgbrennancenter.orgThe Insurrection Act Explained This act has been amended over time and is the primary legal mechanism by which military forces can be legally deployed within U.S. Borders.

Recent legal developments illustrate these principles in practice. For example, a federal judge ruled that the Trump administration's deployment of military troops to Los Angeles during immigration raids was illegal because it did not meet the strict legal criteria required for such deployment.latimes.comlatimes.comTrump deployment of military troops to Los Angeles was illegal, judge rules in... This ruling underscores that simply citing "high crimes" or law enforcement needs does not automatically justify military intervention.

PBS News further clarifies that the standard for deploying active-duty military domestically is not discretionary but bound by limited legal circumstances.pbs.orgpbs.orgWhat U.S. law says about Trump’s deployment of active duty troops to Los Angeles Reuters highlights ongoing debates and fragility around these limits, showing that while exceptions exist, they are narrowly construed and subject to judicial review.reuters.comreuters.comTrial shows fragility of limits on US military's domestic role

Newsweek adds that beyond legality of deployment, there are constitutional concerns about what federal troops can do once deployed domestically, reinforcing the restrictive nature of such actions.newsweek.comnewsweek.comCan Donald Trump's National Guard Deployments Be Stopped?

In summary:

Therefore, while not an absolute ban, the federal government cannot deploy troops domestically for high crimes in a city unless very specific legal conditions are met.