Demonstrations against Donald Trump continued in cities across the US as the president-elect accused those taking part of being "professional protesters".
Police declared a protest in Portland, Oregon, to be a riot, while there were peaceful marches against Mr Trump's unexpected election as president in cities including Dallas, Philadelphia, Chicago and New York.
Mr Trump said the protests were "very unfair!"
Just had a very open and successful presidential election. Now professional protesters, incited by the media, are protesting. Very unfair!— Donald J. Trump (@realDonaldTrump) November 11, 2016
He had earlier held a cordial White House meeting with President Barack Obama, and sketched out priorities with Republican congressional leaders in Washington.
The meeting with Mr Obama spanned 90 minutes, longer than originally scheduled. Mr Obama said he was "encouraged" by Mr Trump's willingness to work with his team during the transition of power, and the Republican called the president a "very good man".
"I very much look forward to dealing with the president in the future," Mr Trump said from the Oval Office. He will begin occupying the office on January 20.
In Portland, hundreds of people marched throughout the city as protests turned violent, with people smashing store windows and lighting firecrackers.
Police declared a riot, said there were people with baseball bats in the crowd and told marchers via loudspeaker to move on.
Oregon Department of Transportation officials closed portions of Interstate 5 and Interstate 84 in the area intermittently as a precaution.
In Denver, protesters managed to shut down Interstate 25 near central Denver briefly on Thursday night.
Police said that demonstrators had made their way onto the freeway and traffic was halted in the northbound and southbound lanes for about 30 minutes.
In Dallas, dozens of demonstrators gathered for a second night at Dealey Plaza to speak against the election.
Just like on Wednesday night, the demonstration was peaceful with no disturbances or arrests reported. It ended with a march into the heart of Dallas by protesters carrying signs bearing such slogans as "Love Trumps Hate" and "Spirit Unbreakable".
A crowd that included parents with children in prams gathered near Philadelphia's City Hall. They held signs bearing slogans like "Not Our President," ''Trans Against Trump" and "Make America Safe For All".
About 500 people turned out in Louisville, Kentucky, chanting and carrying signs as they marched. A day earlier, five people were arrested at Western Kentucky University as demonstrators protested against Mr Trump's election.
The protests came as it was confirmed that Mr Trump had won Arizona's presidential contest and its 11 electoral votes.
The Republican president-elect had a solid lead over Hillary Clinton on election night, but a winner was not declared because there were so many uncounted votes. The latest batch of returns tabulated in Thursday made him the clear winner.
It extends a 20-year winning streak for Republican presidential candidates in Arizona. Bill Clinton was the last Democrat to take the state, winning in 1996.
Mrs Clinton was closer to gaining Arizona than Mr Obama, who lost by more than 9 percentage points during his two runs for president, to her 4 points.
Arizona was one of three races that had yet to be declared from the Tuesday election. Michigan and New Hampshire remain too close to call.
As of Thursday, Mrs Clinton was leading Mr Trump in votes nationwide 47.7% to 47.5%, but Mr Trump secured victory in the Electoral College.
Vice President-elect Mike Pence urged a rally in Indiana to support Mr Trump and to pray that the starkly divided country would be reunified.
He told the crowd he was humbled to be Mr Trump's vice president.