Protesters marching in opposition of Donald Trump's presidential-election victory on Wednesday in San Francisco. AP Photo/Jeff Chiu Donald Trump is not happy about the protests against him that have popped up nationwide since he was elected president.

"Just had a very open and successful presidential election. Now professional protesters, incited by the media, are protesting. Very unfair!" Trump said on Twitter on Thursday night.

Trump's assertion that the demonstrators were professionals "incited by the media" was seen as a dismissal of the protesters' concerns.

In a follow-up tweet Friday morning, however, Trump seemed to have a change of heart, writing that he loved the "passion for our great country" that the "small groups of protesters" had.

"We will all come together and be proud!" Trump wrote.

Thousands of people have flooded streets and freeways in major cities — including New York, Chicago, Los Angeles, the San Francisco Bay Area, and Detroit — to express their distaste about Trump's election.

The protests have continued since Trump beat Democrat Hillary Clinton in a historic upset early Wednesday morning.

Many of those demonstrators say they are afraid of what the Trump administration will do after he ran a campaign they saw as leaning heavily on racist, xenophobic, and sexist bombast. The protesters have also said they are troubled by white-supremacist groups emboldened by Trump's victory.

Trump was endorsed by both the Ku Klux Klan and former KKK leader David Duke. Though the real-estate mogul has disavowed those endorsements, both the KKK and Duke have reiterated their adulation. Duke, who was running for a US Senate seat in Louisiana, said at a debate earlier this month that he would be Trump's "most loyal advocate" if he were to win the seat.

And after Trump won the White House, Duke said "our people played a huge role" in electing him. Duke lost his Senate race.

The president-elect visited the White House on Thursday for his first meeting with President Barack Obama. The closely watched powwow came after a bitter election — one in which Trump and Obama threw rhetorical jabs at each other on the campaign trail.

Trump, in another tweet, had only positive things to say about the meeting, including that he and Obama had "great chemistry."