Hordes of demonstrators converged in central London on Friday, intent on mocking U.S. President Donald Trump on his only full day of business with British leaders on what was dubbed a "working visit" to the United Kingdom. The visual cornerstone of the anti-Trump protests -- which included several organized marches by varying groups -- was a giant balloon depicting the U.S. leader as an angry, screaming orange baby in a diaper, clutching a cellphone with Twitter on the screen.
London Mayor Sadiq Khan, who has clashed for months on Twitter with Mr. Trump, had to give the final approval for "Trump baby" to fly. Mr. Trump has acknowledged that he feels unwelcome in the British capital, suggesting it was part of the reason he didn't spend much time there during his U.K. visit.
"Trump baby," as the balloon is known, was flown high over Parliament Square in London, but Mr. Trump spent the day miles away from the center of the British capital -- and the protesters -- in meetings with Prime Minster Theresa May and then later with Queen Elizabeth II.
Tens of thousands were expected to march through the streets of London to protest the American leader's visit to the U.K., his policies on issues ranging from immigration and race relations to women and climate change.
Protesters mock Trump during visit
But as CBS News correspondent Mark Phillips reported, this was not the grand visit he was originally promised -- it was a much delayed, much diminished "working visit," most of it planned away from the protesters' own special welcome.
Leo Murray, who calls himself "Trump baby's" daddy, told Phillips that the 20-foot-high protest balloon design was chosen deliberately because Mr. Trump, "is uniquely vulnerable to personal insults, so we just got right down at his level, to speak to him in a language that he understands."
Murray, grandson of a former Labour Party parliamentarian, has a history of leading protests but says the balloon idea emerged one afternoon at a pub with friends.
Mr. Trump declared on Thursday in Brussels that, "I think they like me a lot in the U.K."
According to recent surveys by non-partisan British polling organization YouGov, only 11 percent of Britons said they thought Mr. Trump was a "great" or "good president." By contrast, 67 percent said they believed he was a "poor" or "terrible president."
As Phillips says, on the whole, the U.S. leader didn't get the reception in Britain that he had hoped for.
U.K. opposition leader: "We're united in our hope"
U.K. opposition leader Jeremy Corbyn was among those who spoke at an anti-Trump rally in London's Trafalgar Square, which organizers said over 100,000 people attended, CBS News' Haley Joelle Ott reports. CBS News was unable to independently verify that number.
Protesters had been marching all day against President Trump's visit to the U.K. Smaller demonstrations took place at other locations across the country.
"Together, here in London and around this country, our message to our visitor is we're united in our hope for a world of justice, not division, we're united in our hope to end racism and misogyny, we're united in hope for all our diversity," Corbyn told a crowd of protesters.