US president Joe Biden attacked the Trump movement as the “most extreme political organisation” that has existed in recent American history, sharpening his criticism of the former president’s hold on the Republican party in the wake of revelations over the conservative-led Supreme Court’s likely move to gut abortion rights.

Biden’s comments on Wednesday morning came as Democrats have expressed outrage at the leaked draft of a Supreme Court opinion that heralded a move by the justices to strike down Roe vs Wade, the 1973 legal precedent that guaranteed abortion rights in the US.

The publication of the document could upend the political dynamic ahead of November’s midterm elections, offering Democrats an opportunity to energise their base and portray Republicans as drifting dangerously to the right and increasingly influenced by Donald Trump.