Sen. Ted Cruz is crediting Sen. Elizabeth Warren with helping sway senators to vote to acquit President Trump in his impeachment trial.

During the trial on Thursday, the Massachusetts Democrat, who is running for president, submitted a question to Supreme Court Chief Justice John Roberts which questioned his credibility. The question was read aloud by Roberts.

"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?" Warren, 70, asked.

Cruz, 49, said Warren tried to give her presidential campaign a boost ahead of the Iowa caucuses, but it backfired by driving Republicans to vote against calling additional witnesses to testify.

“Elizabeth Warren helped defeat the impeachment of the president of the United States,” the Texas Republican said on his podcast, The Verdict.

“That stunt helped deliver the votes of Lisa and Lamar,” he added, referring to Sen. Lisa Murkowski, an Alaska Republican, and Sen. Lamar Alexander, a Tennessee Republican.

Alexander, 79, said Thursday he would not support extending the trial to subpoena new witnesses and additional documents related to articles of impeachment against Trump.

The next day, Murkowski, 62, said she would join all but two of her Senate Republican colleagues in opposing witnesses, delivering a win to the White House.

In her statement, Murkowski said it had “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.”

“I will not stand for nor support that effort. We have already degraded this institution for partisan political benefit, and I will not enable those who wish to pull down another,” she said.