Advocacy groups prepare for the "No Kings" rallies in the U.S., calling for government accountability and public vigilance under the Trump administration.

The messaging is centered on what they call President Donald Trump’s authoritarian overreach, including threats to deploy National Guard troops in cities and a continued mass‑deportation agenda.Earlier report: New Nationwide 'No Kings 2' Rally Billed As 'Biggest Ever' Coming Soon: What To Know “This isn’t just politics.

Millions of Americans are expected to attend rallies and marches throughout the U.S., four months after the first No Kings Day drew massive crowds.

“As the president escalates his authoritarian power grab, the No Kings nonviolent movement continues to rise stronger. We are united once again to remind the world: America has No Kings and the power belongs to the people,” the group wrote in a press release.

These developments have occurred just as grassroots organizers have scheduled another large nationwide demonstration on Oct. 18 against the increasingly authoritarian Trump administration. The protest is a sequel to June’s “No Kings Day,” which saw a massive turnout in Phoenix and across the nation.

Protesters once again are expected to gather in streets across the country this weekend in opposition of President Donald Trump’s policies. Here's what you need to know about the demonstrations.

A 'No Kings' rally protesting President Donald Trump's policies is scheduled for Oct. 18 in Manitowoc's Washington Park.

Organizers say the energy Saturday will be a message to both Trump and elected Democratic leaders that people want change.