Extra police presence at Trump's DC hotel as protests continue across nation

WASHINGTON - President-elect Donald Trump says it's "very unfair" that some Americans across the U.S. have been protesting his being elected.

Trump took to Twitter Thursday night as people unhappy with his triumph took to the streets to demonstrate. Some 4,000 protesters surged into downtown Portland, Oregon, and several people were arrested as police trying to push back the crowd had objects thrown at them.

On Thursday, hundreds of protesters marched through Baltimore to the stadium where the Ravens were playing a football game. The protest brought traffic to a standstill but was otherwise peaceful. The Baltimore Police Department says in statement that the protest attracted a crowd of roughly 600 people. The statement says two people were detained by police but no one has been charged.

There were also more demonstrations in New York, Chicago and other cities on Thursday.

A large police presence was in place at the Trump International Hotel in downtown Washington, D.C. on Friday morning.

In a new tweet Friday, Trump said, "Love the fact that the small groups of protesters last night have passion for our great country. We will all come together and be proud!"

The Associated Press contributed to this report.