East Derry MP Gregory Campbell has said that 'many people' are saying that the 2017 Foyle MP election was a 'clear case of electoral fraud'.
Sinn Fein's Elisha McCallion beat incumbent MP, the SDLP's Mark Durkan to win the seat by 169 votes in June.
Mr Campbell made the comments during a discussion on 'Electoral Fraud' in the House of Commons.
Conservative MP for Boston and Skegness Matt Warman asked "what progress the Government has made on tackling electoral fraud?"
Mr Campbell raised the issue of the Foyle parliamentary election.
"Is the Minister aware that at the general election in June, there was a 300% increase in proxy votes in the Foyle constituency, resulting in Sinn Féin winning the seat by 169 votes?" he said.
"Many people are specifically saying that that was a clear case of electoral fraud and the theft of a constituency in this House. What will the Minister do to ensure that that does not happen again?"
Minister for the Constitution Chris Skidmore said the government was looking at legislation to tackle electoral fraud.
On the general principle of electoral fraud, it is absolutely right that we look at future measures to tackle electoral integrity," he said.
"It is important that we should have confidence in our democratic system going forward. We will be looking at absent voting arrangements and postal vote harvesting, and we will introduce legislation in future to tackle these issues."
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