"That is a bit of camouflage, and a bit of cover for the decision, because if all her MPs were united behind her she would have a majority of 12 no matter what any other party did", he said during the Loud & Clear broadcast.
Members of Parliament in the British House of Commons gave their backing Wednesday to prime minister Theresa May's call for a snap general election on June 8.
While promising to run a "positive and optimistic campaign", she said the choice at the election was between her "strong and stable leadership" or a "coalition of chaos" led by Mr Corbyn.
Mr McDonnell has accused the Prime Minister of putting "party before country" in holding a General Election on June 8.
If her Conservative Party wins a majority, as surveys expect it to, May would not be required to call another general election until 2022.
"If you look at the timetable, had the election been in 2020 we would have been coming up to the most crucial part of the negotiations, at the end of the negotiations, in what would be starting to be the run-up to a general election".
May's Conservatives now hold 330 of the 650 seats in the House of Commons.
In Scotland, voters previous year favored staying in the European Union, compared with overall 52-48 percent British support to depart the organization.
Another possible reason Hedley mentioned was the "absolute disarray" and disunity in which the Labour Party now finds itself - implying the rejection of Jeremy Corbyn by the Parliamentary wing of a Labour party "stuffed mainly by careerists and opportunists" - which he compared to the Clinton wing of the Democratic Party in the US.
She said on Tuesday she had "reluctantly" come to the decision to call for an early election because of political division in Westminster, criticizing opposition parties for trying to thwart her plans for leaving the EU.
Stephen Colbert and 'Stephen Colbert' bid farewell to Bill O'Reilly
Colbert went on to say that he and O'Reilly didn't see "eye to eye on anything", but that having him gone was a huge deal. On the other hand, the 67-year-old mused about retirement last year, saying "I don't want to work this hard much longer".
As the measure does not need approval from the House of Lords, the process of dissolving parliament next month in advance of the election will get underway.
"The Prime Minister says we have a stronger economy, yet she can't explain why people's wages are lower today than they were 10 years ago or why more households are in debt, six million people earning less than the minimum wage, child poverty is up, pensioner poverty is up".
Michelle Thomson and Natalie McGarry, the two Nationalist MPs who resigned the SNP whip following separate police investigations, were among the MPs to vote against an election.
Anne Richards, chief executive of investment manager M&G Investments, said she thought the election move was due to the timing of Brexit talks, not a "potential squeeze" on real incomes.
European Union officials say Britain's surprise election will not interrupt the bloc's preparations for Brexit talks " though they will slightly delay the start of negotiations.
Corbyn condemned May's reluctance to participate in a televised debate with other party leaders before the election, as has Tim Farron, the leader of another opposition party, the centrist, pro-Europe Liberal Democrats.
"We won't be doing television debates", May said, adding that politicians should spend election campaigns "out and about" meeting voters.
"But this is a prime minister who promised there wouldn't be one". TV debates don't have a long history in British politics, but were a feature of the last two elections, in 2010 and 2015.
As Home Secretary she was responsible for a tightening of immigration rules, and her tenure as Prime Minister has seen her put immigration control - from both within and outside the European Union - at the heart of her agenda, despite warnings that it could damage efforts to secure trade deals, including one with India.
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