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A group of technology companies is to discuss submitting a legal filling known as an amicus brief in support of a lawsuit challenging Trump's travel ban.
A spokesperson for software company GitHub, which is organising the meeting said Alphabet Inc's Google, Airbnb Inc and Netflix Inc are among the companies invited to the meeting on Tuesday.
Thousands of people gathered outside the US Embassy in Ottawa, Canada to protest against Trump's executive order signed last week.
Around 2,000 people created a human chain around the building, according to local media.
A similar protest was held at the US Consulate in Toronto.
Protests have been taking place across the world since Trump imposed a 90-day ban on immigration of nationals from seven Muslim-majority countries.
Video: Instagram/Mojdeh Cox via Storyful
- Video report by ITV News Political Editor, Robert Peston
Anger with the UK's decision to hold a state visit for America's new president Donald Trump has sparked protests across the country including Manchester, Newcastle, Edinburgh and just outside Downing Street.
The foreign secretary, facing questions in the House of Commons over Trump's controversial ban, said the move was "divisive" but insisted the government would continue to engage with the president.
UK nationals born abroad and dual nationals travelling from Britain are not affected by the ban and there will be similar exemptions for those from New Zealand, Australia and Canada.
But others are in limbo and stranded at airports.
Former US President Barack Obama has said he is "heartened by the level of engagement taking place in communities" around the US, as people protest against Donald Trump's immigration ban.
Kevin Lewis, a spokesman for Obama, said the president "fundamentally disagrees with the notion of discriminating against individuals because of their faith or religion".
- Video report by ITV News Washington Correspondent, Robert Moore
At the White House on Monday, President Donald Trump made clear he had no regrets over his executive order imposing a travel ban on some Muslim-majority countries.
He also dismissed travel chaos at several US airports and criticism to the policy including that from New York Senator Chuck Schumer.
"I notice Chuck Schumer yesterday with fake tears," the President said. "I'm going to ask him who is his acting coach."
- Video report by ITV News Political Correspondent Paul Brand.
Prime Minister Theresa May has insisted Donald Trump's controversial state visit to the UK will go ahead, despite a million-strong petition against it, and protests in many British towns and cities taking place tonight.
Mrs May said she does not agree with the new US President's controversial travel ban on visitors from seven Muslim-majority countries but the invitation will not be withdrawn.
The Prime Minister has said President Trump's invitation to the UK on a state visit "stands".
She told reporters: "The United States is a close ally of the United Kingdom.
"We work together across many areas of mutual interest and we have that special relationship between us.
"I have formally issued that invitation for a state visit for President Trump to the United Kingdom and that invitation stands."
Labour MP Mike Gapes has accused the Prime Minister of 'appeasing' US President Donald Trump by inviting him on a state visit to the UK within the first week of him taking office.
He was speaking in the House of Commons after Foreign Secretary Boris Johnson made a statement on Mr Trump's travel ban on refugees and citizens from several mainly-Muslim countries.
Mr Gapes pointed out that both George W Bush and Barack Obama waited more than two years before they were officially invited to the UK.
He called Mrs May 'Theresa the appeaser' but Mr Johnson said the reference was "distasteful"
Latest ITV News reports
ITV News has travelled to Michigan, which has a large Muslim population, and spoke to residents about the divisive visa crackdown.
Thousands of people have taken to the streets across the UK to protest against Donald Trump's travel ban.