The secretary was confirmed by a party-line vote is the correct option.
A political party's official position on a given topic, which its members are required to follow, is known as the party line.
A group's official position, strategy, or objective is known as its party line. Legislators that tightly toe the party line and cast their votes as the party desires tend to make political parties the happy.
Party lines are often associated with political parties and organizations, while other organizations, such as enterprises, clubs, or religions, frequently have party lines that members are expected to adhere to. Toeing the party line, also known as adhering to the official party line, is a term that is frequently used when a politician gives a speech. Long ago, a party line was also a telephone landline that was shared by several families.
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