The Prime Minister easily cleared the hurdle needed under the Fixed Term Parliament Act to bring the poll forward from the scheduled date of 2020.
Mrs May said she had made clear to European Council president Donald Tusk that she wants an early agreement on the status of EU nationals living in the UK.
The British Parliament approved a snap general election on Wednesday, even though general elections weren't due for another three years.
Riding high in the opinion polls, May is seeking to increase her slim majority of 17 in the 650-seat Commons before the battles begin with the European Union over Britain's exit bill and future trade and immigration ties.
During a House of Commons vote earlier this afternoon (April 19), MPs voted 522 in support of the Prime Minister's snap general election, with 13 votes against.
"Scottish Labour will be putting forward a positive vision for a fairer United Kingdom that rejects both the Tories' plans for a hard Brexit and the SNP's plans for a divisive second independence referendum".More news: Canada's telecom regulator rules online data be treated equally
Currently, the Conservative Party has a narrow majority of 330 of the 650 seats in the House of Commons.
Senior lecturer in politics at the University of York, Dr. Sofia Vasilopoulou, said: "It is a good opportunity to put Conservative party divisions on ice in the interest of winning the general election".
The chaotic scenes overshadowed Labour's first full day of election campaigning.
South Staffordshire MP Mr Williamson said: "This election will be the ideal chance for Britain to give Theresa May the mandate to strengthen our negotiating position with the EU".
All said and done, however, whatever be the outcome of the election, Brexit is a reality from which there is no going back.
Here comes "hard Brexit": What can Canadians expect on trade rules?More news: Monaco's Mbappe sets Champions League records against Borussia Dortmund
However, the last American and British elections, as well as the European Union referendum, have also showed that polls can be mistaken.
"This is about the shape of Britain post-Brexit and I think on that territory, with the policies that we've got, that's a battle we can rise to - but rise to it we must".
Opposition Labour leader Jeremy Corbyn insisted on Thursday that he could still win Britain's snap June general election despite dire poll ratings, pitching himself as an anti-establishment candidate fighting for change.
The Liberal Democrats attacked the Prime Minister's decision to rule out taking part in televised debates ahead of the election.
She said that "Brexit isn't just about the letter that says we want to leave". Those have been held before; there have also been plenty of elections, in the past century or so, dominated, as this one will be, by the "center-right" Conservative Party and the "center-left" Labour Party.
'What do we know that the leader of the Labour Party, the leader of the Liberal Democrats and the leader of the Scottish nationalists have in common?' she asked parliament.More news: MPs vote in favour of snap General Election on 8 June
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