The first recall petition, which could see a by-election held in the North Antrim constituency, has been opened.
Democratic Unionist MP Ian Paisley Junior was suspended from the House of Commons for 30 days after his failure to register two family holidays paid for by the Sri Lankan government.
This triggered the recall procedure and should 10% of the electorate, or 7,543 people, sign a petition then a by-election will be held.
Mr Paisley had already apologised for what he said was his "unintentional failure" to register the hospitality, which he estimated was worth £50,000.
From this morning, voters can sign on at three locations in the constituency and the process will run for six weeks.
Sinn Féin's Stormont Assembly member Philip McGuigan said: "This is an issue of integrity in government, it is not an orange and green issue.
"This is not even about nationalism versus unionism.
"This is an issue about trust in your politicians that they will do their jobs with integrity."
Mr Paisley, who has been MP for the constituency since 2010, following in the footsteps of his father, has said he would stand in a by-election if one is called.
Last week, he was registered on the Westminister parliament's website as an Independent.
The House of Commons said this was a procedural matter and Mr Paisley would remain listed as an Independent until his suspension was concluded.
The DUP is carrying out an internal party investigation into his conduct.
The suspension without pay will begin on 4 September.