Labour MP Jess Phillips is lambasting Boris Johnson for carrying out a "strategy to divide," and demanding he apologize for using the murder of Jo Cox as part of his Brexit pitch in Parliament.

"We all get abuse, and I've had a death threat this week that literally quoted the Prime Minister and used the Prime Minister's name and words in a death threat that was delivered to my staff," she told the House of Commons.

"What I want answers to today, is when there is a clear strategy to divide. The use of language yesterday and over the past few weeks ... it has clearly been tested and work-shopped and worked up and it is entirely designed to inflame hatred and division."

"I get it, it works. It is working," Phillips said. "We're all ambitious, I'm not going to pretend I'm not ambitious, but I also have a soul."

Phillips is asking an urgent question to Boris Johnson on his use of language, but Johnson hasn't shown up to answer it. Instead, he's being represented by the Parliamentary Under-Secretary for Wales, Kevin Foster.

"It is not sincere, it is totally planned, it is completely utterly a part of a strategy designed by somebody to harm and cause hatred in our country," she went on.

"The people opposite me know how appalling it was to describe the murder of my friend as mere humbug."