Washington (CNN) In announcing that she would vote against the Senate calling witnesses, Sen. Lisa Murkowski suggested that her decision was made in part to spare Chief Justice John Roberts from having to face a 50-50 tie, allowing him to avoid a legal and political storm.

"It has also become clear some of my colleagues intend to further politicize this process, and drag the Supreme Court into the fray, while attacking the chief justice," the Alaska Republican said Friday afternoon.

Her statement appeared to be a direct response to Sen. Elizabeth Warren of Massachusetts, a Democratic presidential candidate who had essentially forced Roberts to speculate about his credibility on national television.

Warren had submitted a question for the chief to read:

"At a time when large majorities of Americans have lost faith in government, does the fact that the chief justice is presiding over an impeachment trial in which Republican senators have thus far refused to allow witnesses or evidence contribute to the loss of legitimacy of the chief justice, the Supreme Court and the Constitution?"

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