"You lost," Moore said the note read. "Step aside."
The liberal activist and outspoken critic of Trump was one of the few to predict Trump would win the election. A few weeks before Election Day, the filmmaker released “Michael Moore in TrumpLand,” a hastily produced pro-Hillary Clinton monologue that was vehemently critical of the Republican presidential nominee.
A Trump victory, Moore shouted in the film, would be "the biggest f--- you ever recorded in human history."
On Saturday afternoon, he arrived at Trump Tower with a camera crew behind him and a smartphone in hand, and broadcast his visit using Facebook Live.
“I just thought I’d see if I could get into Trump Tower and ride the famous escalator," Moore said to a bystander who asked what he was doing there. Maybe, he added, Trump would talk to him.
Moore wore a San Francisco 49ers baseball cap and a dark sweater with a safety pin attached to the front, meant to signal that he was an ally to minorities, he explained later. Moore's entrance into the lobby around 1:10 p.m. caused "a stir," according to a pool report, and he was trailed by several reporters and photographers.
In the Facebook Live stream, Moore described the lobby and the marble-covered interior of Trump Tower, and at one point reminisced that his mother used to stop in the mall-like building to rest when she came to New York. Moore also told viewers that he had visited the previous Saturday and spoken then to Trump campaign manager Kellyanne Conway.
"It went well," Moore said of the visit. "They didn't kick me out."
As Moore filmed, he rode the escalator up one flight to a mezzanine as others in the building recognized and called out to him. He continued riding the escalators until he reached the fourth floor, where Secret Service agents told him he could not go higher. They rejected his request to take an elevator.
According to the pool report, Moore went back down the escalators and told the doorman guarding the lobby elevators he wanted to see Trump. He ended up leaving him a note — “Mr. Trump. I’m here. I want to talk to you" — after the doorman said he could not go upstairs, the report said.
A few minutes later, Moore left the building. His Facebook Live broadcast of his visit lasted about an hour and a half.
"I'm opposed to this man who did not win the popular vote taking office, and we need to figure out what we can do, legally, nonviolently, to make sure this doesn't happen," Moore said in the Facebook broadcast once back outside near Fifth Avenue.
Shortly after Moore left the building, Nigel Farage of the UK Independence Party reportedly also walked into the lobby of Trump Tower, accompanied by an unknown person. They were allowed up to meet with Trump, according to the Associated Press.
Demonstrators have protested in dozens of American cities since Trump was elected president on Tuesday. The mostly nonviolent protests began early Wednesday in New York and other major cities and dozens of smaller ones.
Police in New York said about 65 people were arrested during the first night of protests, mostly for disorderly conduct or resisting arrest.
Clinton's apparent narrow victory in the popular vote, coupled with her loss in the electoral tally, spurred demonstrators in New York to chant “She got more votes!” as thousands massed in front of Trump Tower in Midtown Manhattan Wednesday night, The Washington Post reported. The crowd stretched several blocks down Fifth Avenue.
Before that, protesters had marched from Union Square to Trump's building, chanting, “Donald Trump, go away! Sexist, racist, anti-gay!”
At one point, demonstrators lit an American flag on fire. Later, amid a cacophony of loud chants, a glowing “Love Trumps Hate” banner was held aloft under the Trump Tower sign. The singer Cher mingled in the crowd, doling out hugs.