U.S. President Donald Trump on Monday said he might use the Insurrection Act, a law authorizing the president to deploy military forces on U.S. soil, if courts and governors continue to block his deployment of National Guard troops in Democratic-led cities.

President Donald Trump and his top aides are using the word “insurrection” more frequently to describe anti-ICE protests in places like Portland.

After a court blocked Donald Trump’s National Guard plans in Portland, talk of invoking the Insurrection Act resurfaced. Here’s how the law works and when it’s been used.

President Trump on Monday likened the situation in Portland, Ore., to an “insurrection,” but said he did not yet see a need to invoke the Insurrection Act, which would allow him to