The couple wrote to the former Labour leader before stepping back from senior royal duties, a new book has revealed.
Outgoing Labour leader Jeremy Corbyn says the coronavirus crisis has proved that he was right about public spending.
The Labour deputy leadership candidate said he is 'proud' to be the 'continuity Corbyn' candidate, despite the party getting 'smashed' in December's election.
Labour suffered its worst election defeat since 1935 but the deputy leadership candidate insisted: 'Nobody hated the policies.'
The former PM said Brexit could have been prevented if Labour had been a 'serious opposition' under Jeremy Corbyn.
The Labour leadership candidate reportedly said she would give Jeremy Corbyn a role in her Cabinet if she becomes prime minister.
The remark came after the Labour leader called for foreign secretary Dominic Raab to be sacked.
Mike Gapes said the party is facing an even longer spell out of government than it did between 1979 and 1997.
Lisa Nandy is currently trailing in the polls in the Labour leadership contest.
Richard Burgon said the 'billionaire press attacked Jeremy because he pursued policies that would take on the rigged economy'.
The Labour leader defended the couple after they were criticised for their decision to step back as senior royals.
The image demonstrates how Jeremy Corbyn’s “New Clause 2” amendment to Mr Johnson’s Brexit bill was voted down convincingly by the Tories.
Rebecca Long-Bailey and Richard Burgon are close allies of current leader Jeremy Corbyn and shadow chancellor John McDonnell.