Demonstrators gathered at Civic League Park in San Angelo as part of nationwide "No Kings" protests on Saturday.

"No Kings" protests are being organized across North Texas and nationwide to challenge what organizers describe as the growing authoritarianism and corruption of President Donald Trump and his allies.

Organizers of the “No Kings” demonstrations said millions had marched in hundreds of events. In Oregon, tens of thousands of people gathered in downtown Portland for two large protests -- one that began in Tom McCall Waterfront Park and the other at the Oregon Convention Center.

Tens of thousands of Americans joined "No Kings" protests across the United States against the Trump administration.

Follow live updates as the military parade in Washington, D.C., kicks off on Trump's birthday. 'No Kings' protests by opponents are planned across the country today.

The Houston demonstration is one of several planned in the region throughout the day and is expected to draw thousands of protesters.

The protest coincides with the U.S. Army’s 250th anniversary celebration and parade, which is also President Donald Trump's birthday and Flag Day.