Here are on-going snippets.
3m ago
18:52
The Labour MP Liam Byrne says he is a great supporter of America. He was a Fulbright scholar, and spent two years in the country. He says he admires America for its qualities like generosity. But Trump does not reflect those values.
This week it is Washington Day, marking George Washingtons birthday. It was said Washington could not tell a lie. With Trump, it is as if he cannot tell the truth, Byrne says.
He says he fears that, if Trumps visit goes ahead, it will be divisive. The protests will make todays demonstration look like a tea party.
And people in America will see the demonstrations and think that they say something about that Britons think of America, not what they think about Trump.
He accepts it is probably too late to withdraw the offer of a state visit now. But if the visit must go ahead, it should be short, he says. It certainly wont be sweet.
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8m ago
18:46
The Labour MP Dawn Butler says she represents Brent Central in London, one of the most diverse constituencies in Europe.
She says it is often said that when America sneezes, Europe catches a cold. But now the US has a pretty nasty virus, she says.
She says people are protesting outside Westminster because they feel so strong about Trump.
According to the SNP MP Patrick Grady, the demonstration can be heard in Westminster Hall, where the debate is taking place.