The Unite head's comments suggest the shadow health secretary could win his support in a future leadership contest.
The union is prepared to reduce the shortfall but will expect policy concessions in return.
The Labour leader’s changes have left his party best placed to overcome the crisis of political participation.
The Unite general secretary signalled that he would no longer tolerate those who "welcome our money but don't want our policy input".
With Labour more reliant on large one-off donations from unions, the Unite general secretary is in a stronger position to push for policy changes.
If the allegation that the union signed up members to Labour without their knowledge or consent is proven, it could be charged with fraud.
By choosing to answer the question "who runs Labour?" the Unite general secretary has suggested the answer was in doubt.
Of the 14 Labour constituency parties placed under "special measures", just one, Falkirk West, was due to concerns over activity by Unite.
In a letter leaked to The Staggers, the Unite general secretary hits out over the Falkirk selection row.
The Unite general secretary claims that my piece on him was "a distortion". Here's why it wasn't.