Labour says a government plan to close a loophole in future cases should also apply retrospectively.
Read moreBy Ione Wells
Political correspondent
BBC News Parliaments
We must learn from this hideous killing - Speaker
Commons Speaker Sir Lindsay Hoyle says MPs should be protected - but warns against a knee-jerk response.
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We must learn from this hideous killing - Speaker
Commons Speaker Sir Lindsay Hoyle says MPs should be protected - but warns against a knee-jerk response.
Sir David Amess: Fun, friendly and always outspoken
The Tory MP was a backbencher of the old school who fought for the causes he cared about.
As it happened: MLAs' tributes to Sir David Amess
Members of the Legislative Assembly paid tribute to Sir David Amess who was stabbed in his constituency
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We must learn from this hideous killing - Speaker
Commons Speaker Sir Lindsay Hoyle says MPs should be protected - but warns against a knee-jerk response.
Sir David Amess: Fun, friendly and always outspoken
The Tory MP was a backbencher of the old school who fought for the causes he cared about.
As it happened: MLAs' tributes to Sir David Amess
Members of the Legislative Assembly paid tribute to Sir David Amess who was stabbed in his constituency
Sir David Amess: Fun, friendly and always outspoken
The Tory MP was a backbencher of the old school who fought for the causes he cared about.
As it happened: MLAs' tributes to Sir David Amess
Members of the Legislative Assembly paid tribute to Sir David Amess who was stabbed in his constituency
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Video caption: Sir David Amess death: Parliament pays tribute to former colleague MPs have been remembering Sir David Amess, who was killed in his Essex constituency.
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Video caption: Boris Johnson pays tribute to Sir David Amess in Commons Boris Johnson announces the Queen has agreed city status for Southend, thanks to Sir David Amess’ campaign.
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Video caption: Minute's silence for Sir David Amess in House of Commons The Speaker’s chaplain leads a minute’s silence in the House of Commons for Sir David Amess MP.
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Video caption: Sir David Amess: Candlelit vigil in Leigh-on-Sea Hundreds of people carrying lanterns and candles gathered in Leigh-on-Sea to pay their respects.
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Video caption: Sir David Amess: Political world pays tribute to much-loved MP Boris Johnson has led tributes from the political world for Sir David Amess. The Prime Minister said he was one of the "one of the kindest, most gentle people in politics".
What security measures are in place for MPs in their constituencies?
MPs' security was a big political issue even before the killing of Labour's Jo Cox in 2016. Following that attack, all MPs were offered panic buttons, extra lighting, additional locks and emergency fobs at their homes and constituency offices.
Prior to that, those wanting enhanced security arrangements had to ask police to carry out a risk assessment and produce written estimates before any work could be carried out.
Official data shows the amount spent on such measures rose from £171,000 in 2015/16 to £4.2m in 2017/18.
Parliament also offers MPs and their staff guidance on security, including tips on how to run a safe constituency surgery, suspicious post and risks at home.
A Parliamentary report published earlier this year called for "clear central guidance" for police forces on how to deal with the harassment of MPs - and for a greater recognition of the "threat to our democracy posed by" offences committed against them.
By Enda McClafferty
BBC News NI political editor
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Video caption: Queen opens Senedd's sixth term in first visit to Wales in five years Greeted by a 21-gun salute, the monarch was joined by the Prince of Wales and Duchess of Cornwall.
By Louise Cullen
BBC News NI
