The potential for the Democrats to add four justices to the US Supreme Court is stemming from a tremendous appetite from the left of the party to control all branches of government, according to US Studies Centre CEO Simon Jackman who spoke to Sky News.

“Congress, coequal branch of government, incredibly important and so delicately poised at the moment [with] the deft and constant political management that Speaker Pelosi has to engage in,” he said.

The left flank of Congress believe Democrats could have total political control with the addition of the justices but the centrists who are “staring at dire re-election prospects” are not in favour of the proposal.