Final answer:
George Washington did not believe that the Senate would soften extreme legislation of the House. He believed that the Senate's role was to cool down legislation.
Step-by-step explanation:
False. George Washington believed that the Senate would play a role in cooling down extreme legislation proposed by the House. This belief is often illustrated by the simile of pouring legislation into the senatorial saucer to cool it. However, it's important to note that Washington sought the Senate's advice and consent on treaties and appointments, indicating the importance he placed on their role in foreign policy and governance.