A group of Conservative MPs will attempt to force a Commons vote over a referendum on the UK's European Union membership next week.
The MPs are seeking to engineer a vote on an EU referendum by tabling an amendment to the Queen's speech.
Prime Minister David Cameron earlier defended his approach of seeking fundamental reform and holding a referendum on membership before the end of 2017.
Read more: Ex-chancellor calls for EU exit
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John McDonnell says voters can expect to see "no increases in income tax for middle or low earners" in Labour's election manifesto.
The prime minister has confirmed the Conservative government will not increase VAT if they win the General Election on June 8.