What is loose constitutionalist?

a loose constitutionalist is someone who "reads between the lines" of the Constitution. Alexander Hamilton used this tactic when he was trying to pass the National Bank through Congress. He called upon the "necessary and proper clause", saying the bank fit under this category, and therefore was Constitutional. Jefferson argued that the clause was too vague, and therefore Hamilton could not use that argument to further his cause. It passed anyway, with Washington's voice of approval.