Former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE said over the weekend that the Supreme Court's legitimacy can be "justifiably" questioned, citing Brett Kavanaugh's confirmation as a justice.

"With the confirmation of Kavanaugh and the process which led to it, (and the treatment of Merrick Garland Merrick Brian GarlandPoll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Chief justice honors Ginsburg: 'When she spoke, people listened' MORE), the legitimacy of the Supreme Court can justifiably be questioned," Holder tweeted on Saturday, referencing former President Obama's final Supreme Court nominee, who was blocked by Republican senators.

With the confirmation of Kavanaugh and the process which led to it, (and the treatment of Merrick Garland), the legitimacy of the Supreme Court can justifiably be questioned. The Court must now prove - through its work - that it is worthy of the nation’s trust. — Eric Holder (@EricHolder) October 6, 2018

"The Court must now prove - through its work - that it is worthy of the nation’s trust," Holder added.

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The strong criticism from Holder, who served in Obama's administration from 2009 to 2015, came only moments after the Senate confirmed Kavanaugh to the Supreme Court in a 50-48 vote.

The vote concluded what was a contentious confirmation process in which Kavanaugh faced multiple allegations of sexual misconduct.

Kavanaugh and Christine Blasey Ford testified before the Senate Judiciary Committee last month regarding Ford's claims that he sexually assaulted her at a high school party in the 1980s.

Kavanaugh has fiercely denied the accusation. He's also pushed back against sexual misconduct claims from two other women, Julie Swetnick and Deborah Ramirez.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellFEC flags McConnell campaign over suspected accounting errors Poll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ky.) hailed the Senate's vote to confirm Kavanaugh on Saturday, saying that it sent a clear message.

"This is an institution where the evidence and the facts matter. ... This is a chamber in which the politics of intimidation and personal destruction do not win the day," he said.

On the other hand, many Democrats have decried the outcome.

Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.), for example, said on Sunday that Kavanaugh's confirmation was a "denial of justice for the women of this country and sexual assault survivors, men and women."