RNA - A march on Downing Street in protest over the President’s immigration policy and state visit to the UK attracted tens of thousands of people, Evening Standard reported.
A further demonstration outside the US Embassy is expected to be attended by thousands more people this Saturday.
The protest has been organised by various charities including Stop the War Coalition, Stand up to Racism, Help Refugees Worldwide and the Muslim Association of Britain.
It will oppose the President’s recent temporary US travel ban on citizens from seven predominently Muslim countries and is calling on Theresa May to “stop supporting” him.
The event page – on which 16,000 people have registered their interest – reads: “Trump’s ban on Muslims must be opposed by all who are against racism and support basic human rights.
“Theresa May’s collusion with Trump must end.”
Whitehall was brought to a standstill on Monday after hordes of protesters descended on the city for the march.
Crowds carried signs reading slogans such as “we stand united”, “no Trump travel ban” and “we are all immigrants”.
They led chants including "Donald Trump has got to go" and "shame on May." Other banners read “Trumpty Dumpty” and “Super callous fragile racist sexist Nazi POTUS”.
The demonstrators gathered near 10 Downing Stree. Many said they had never seen a rally so big, adding they could “hear the roar" of the crowd from 10 minutes away.
The new President’s first days in office have been marked with a number of protests around the world – notably the Women’s March which took place the day after he was inaugurated.
It was estimated that millions of men, women and children worldwide took part in the demonstrations, campaigning for equality “in the face of recent political events”.