Final answer:
Congress disagreed with Roosevelt's solution as it would have increased the power of the executive branch, undermining the Constitution's checks and balances.
Step-by-step explanation:
Many members of Congress disagreed with President Franklin D. Roosevelt's proposed solution to the problem he describes, which is essentially the lack of cooperation among the three branches of government, because they believed his plan would lead to an increase in the power of the executive branch. At the time, Roosevelt was proposing what came to be known as the court-packing plan, where additional justices would be added to the Supreme Court, allowing the President to appoint justices who would be favorable to his policies, effectively weakening the judiciary's role as a check on the executive. Given that the U.S. Constitution, influenced by Enlightenment ideas and framed with intricate checks and balances, sought to balance power among the legislative, executive, and judicial branches, Roosevelt's proposal was seen by many as undermining this fundamental principle and tilting the balance too heavily in favor of the presidency.