The Brexit secretary insisted the PM had not called for an early vote because it was “comfortable or easy” but because it was the right thing for the UK.
Speaking to the BBC’s World at One, he said: “This is about getting a mandate from the British people to deliver an outcome.
“The other thing I’d say is it’s not just about delivering Brexit, it is also about delivering on the other aspects of a premiership.
“We had predictions immediately before the referendum outcome, which said that if we voted to leave there will be a terrible disaster for the economy. Actually, [we have the] highest employment ever, lowest unemployment for 10 years.”
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David Davis defended Theres May for calling for a snap general election
Mr Davis added Mrs May had not taken the decision on a whim and suggested the Conservative Party could have sat in Government until 2020 without taking the additional risk a General Election could pose.
He said: “But what she needs is a strong mandate for this negotiation. That she needs because she wants to deliver the best outcome in the national interest, the best outcome for the British people, all of them.
“Elections are unpredictable and indeed the easy thing for the prime minister to do would be to sit on the majority chairs until 2020 and not take any risk.
“But she is a very conscious Prime Minister who takes her duty to the national interest very seriously and that is what this is about.”
This is about getting a mandate from the British people to deliver an outcome
Theresa May revealed on Tuesday she intends to hold an early general election on June 8 as she urged opposition parties to back the Fixed-Term Parliaments Act, which needs to pass with a two-thirds majority in the House of Commons.
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The vote will be held on Wednesday and in her speech outside No 10 the PM brutalised Remainers' for trying to undermine Brexit.
Taking a swipe at Nicola Sturgeon, Jeremy Corbyn and Tim Farron for frustrating the will of the British people, Mrs May said: "I have just chaired a meeting of the Cabinet, where we agreed that the Government should call a general election, to be held on June 8.
"At this moment of enormous national significance there should be unity here in Westminster, but instead there is division. The country is coming together, but Westminster is not.
Live from 10 Downing Street: Theresa May calls snap general election Tue, April 18, 2017
Theresa May has made the announcement to call for an early general election to be held on June 8 2017
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Britain's Prime Minister Theresa May speaks to the media outside 10 Downing Street, in central London
"In recent weeks Labour has threatened to vote against the deal we reach with the European Union. The Liberal Democrats have said they want to grind the business of government to a standsill.
"The Scottish National Party say they will vote against the legislation that formally repeals Britain's membership of the European Union. And unelected members of the House of Lords have vowed to fight us every step of the way.”
The announcement was hailed by the Liberal Democrats as a chance to stop a ‘hard’ Brexit, and one MP accused Mrs May of using the snap election as a smokescreen.
Tom Brake said: “I’m afraid that’s a smokescreen. She’s the person who has chosen to go for the ‘hard’ Brexit.
“She’s the person I suspect who’s now picking up signs in the UK economy, with things like inflation, employers saying they’re going to relocate jobs, European medicine agency for instance.
“She has seen that the UK economy is about to go into a very bad period which will probably last until 2019.
So she has chosen to call a snap general election to try and stabilise her position and give herself five years in which to navigate these very choppy waters that she has created.”