President Trump said on Tuesday that protesters who assembled during a military parade he planned in Washington on Saturday for the Army’s 250th birthday would be met with “very big force” — a dark warning that made no distinction between peaceful demonstrations and violent confrontations.

In remarks from the Oval Office before he left for North Carolina, where he was scheduled to participate in events at Fort Bragg related to the anniversary, Mr. Trump boasted about the “amazing day” he planned before saying that any demonstrators would be dealt with harshly.

“For those people that want to protest, they’re going to be met with very big force,” Mr. Trump said. “And I haven’t even heard about a protest, but you know, this is people that hate our country, but they will be met with very heavy force.”

Mr. Trump’s comments came after the president spent several minutes praising his administration’s deployment of thousands of National Guard and Marines in response to protests that had broken out over the weekend in Los Angeles against sweeping federal immigration raids.

The episodes of unrest have included burned cars, concrete chunks hurled at officers and robberies at spots like an Apple store. Supporters of the California protests who oppose Mr. Trump’s immigration crackdowns have said the protests were largely peaceful, and that the episodes of violence have been amplified by Mr. Trump’s allies and administration.

Mr. Trump’s Oval Office remarks cited some of those violent images, and he maintained, without offering evidence, that the protesters were “paid insurrectionists” He declared that Los Angeles had been “under siege until we got there,” although officials in the state — many of whom have spoken out against the violence — say he has only inflamed tensions by deploying the military.