Donald Trump’s campaign manager took to Twitter Thursday to call on President Obama or Hillary Clinton to speak out against calls for political violence, as unruly post-election protests broke out for the second night in a row in cities across the country.

Police in Portland, Ore. declared that a once peaceful protest was a riot after demonstrators were seen attacking drivers and committing acts of vandalism during their march against Trump’s election Thursday night.

Kellyanne Conway, Trump’s campaign manager, flagged an interview with a woman from a separate protest the night before in Los Angeles. The anti-Trump protester called for people to “fight back,” warning, “There will be casualties on both sides. There will be, because people have to die to make a change in this world.”

Conway tweeted:

Not cool. @POTUS or Hillary should address. 'People Have to Die': Anti-Trump Protester Calls For Violence on CNN https://t.co/NfEqhkrTvu — Kellyanne Conway (@KellyannePolls) November 10, 2016

The president-elect himself has given mixed messages about his views on the unrest.

On Thursday, he blasted “professional protesters” and accused the media of fanning the flames.

By Friday morning, Trump took a different approach.

Whether the protests are building or dying down remains to be seen.

Portland police said at least 29 people were arrested in the riot Thursday night. According to KPTV, one driver had her windshield smashed and someone painted “Capitalism kills” on a nearby convenience store. Police declared the protest a riot at around 8:30 pm. A riot is a Class C felony in Oregon.

The state Department of Transportation briefly shut down Interstate 5 between the Marquan Bridge and the Fremont Bridge due to the demonstration. Parts of Interstate 84 were also temporarily closed.

Protesters in Portland’s Pearl District were breaking windows of several businesses and some were arming themselves with rocks from a construction site, police said.

KPTV reported that the groups Don’t Shoot Portland and Black Lives Matter combined in Portland to become Portland’s Resistance. The founder told the station that “Trump is going to be our president. We need to save our city and hopefully allow people to come here to be a city where there is hope."

Anti-Trump demonstrations erupted across the U.S. for the second straight night, from Portland to Chicago to New York and parts in between.

In New York City, a large group of demonstrators once again gathered outside Trump Tower on Fifth Avenue Thursday night. They chanted angry slogans and waved banners baring anti-Trump messages.

While Obama and Clinton have not directly addressed the protests, both have called for unity.

Obama met with Trump at the White House on Thursday and once again vowed to help with an orderly transition.

“The peaceful transfer of power is one of the hallmarks of our democracy,” Obama said on Wednesday, reminding Americans “we’re actually all on the same team.”

Clinton, in her concession speech, said: “We must accept this result, and then look to the future. ... Donald Trump is going to be our president. We owe him an open mind and the chance to lead.”

White House Press Secretary Josh Earnest, asked Thursday about the protests, said the president believes the right to free speech should be protected.

He added, “It is a right that should be exercised without violence. And there are people who are disappointed in the outcome. And the president's message in the Rose Garden was it's not surprising that people are disappointed in the outcome, but it's important for us to remember, a day or two after the election, that we're Democrats and Republicans, but we're Americans and patriots first.”

The Associated Press contributed to this report.