She stated: "At the last election in 2015 we said this would be a clear choice between a destructive Tory Party and a better future with Labour".
Officially, she argues the stances of Britain's opposition parties risk the country's ability to make a success of Brexit, with the danger of government business grinding to a halt during European Union negotiations.
The Scottish National Party (SNP) leader says the PM's call for a vote on June 8 is "once again putting the interests of her party ahead of those of the country", adding the decision is "one of the most extraordinary U-turns in recent political history" and a "huge political miscalculation". In Scotland it is to be a clear contest between the very different SNP and Tory visions for the future of Scotland.
However, the SNP faces tough decisions in two seats that opposition parties will contest hard, with the Tories confident they may be able to challenge the SNP in several areas where voters oppose independence.
"I can't possibly see what Theresa May would gain for doing this, she effectively has a landslide sized majority in the House of Commons, seems to me she has more risk of losing her majority then making it bigger".
"I'll be fighting my seat on my proud record of local service and be clearly saying we must stop all this constitutional nonsense for the sake of the people we represent".
He was backed up by former SNP Deputy Leader Jim Sillars, who wanted UDI to be enacted if there was an SNP majority at the 2016 Scottish Elections.
Mr Mullin won the seat in 2015, taking it from Labour after Gordon Brown stood down.
Recently, the party has struggled with poor showings in polling across the United Kingdom and its local election forecasts which have projected the Scottish Tories overtaking them as the second party of not only Holyrood but of local government in Scotland.
Britain as a whole voted by 52 per cent to 48 per cent to quit the European Union, yet in Scotland a bigger majority opted to remain, allowing both May to claim that Brexit is inevitable and Sturgeon to call Brexit democratically unacceptable for the majority of Scots who voted against it.
Dugdale who had been hoping to focus on the local elections launch for the party today (Tuesday 18 April) was instead forced to state what her expectations were for her party's performance on both sides of the border.
The SNP will need to see whether McGarry will stand for reelection as an independent in Glasgow East and whether to select a new candidate for Edinburgh West.
"We know the SNP will use this campaign to try and manufacture a case for separation".
The snap election has "thrown a spanner in the works regarding the timing, but it doesn't change the direction of travel", said Craig McAngus, a politics lecturer at Aberdeen University.
"If people want a Britain that is open, tolerant and united, this is the chance".
Scottish Labour, the Liberal Democrats and Scottish Greens have already published their manifestos, with the SNP due to unveil theirs later this week.