The statement that best describes the role of the sentences in the excerpt is:
- They condemn the Senate's past actions as being self-interested and unpatriotic.
In these sentences, the speaker is critiquing the Senate for having the power to undermine the very principles it was established to uphold, which is indicative of a self-serving and unpatriotic stance. The emphasis on preserving the rights and equality of the States suggests a condemnation of any actions that may contradict those founding values.