How can Ginsburg participate in Travel Order case after her *campaign* statements about Trump?

Legal Insurrection

July 2016: “He is a faker”

. . . "The 4th Circuit decision has been widely criticized for its reliance on campaign statements, as well as for substituting judicial security evaluations for those of the executive branch.

"This case, unlike other more mundane cases involving Trump policies that may come before the court, clearly places Donald Trump’s words, personality and credibility in issue.

"One of the Justices already has expressed a view on Trump’s credibility. In July 2016, Justice Ruth Bader Ginbsburg was quoted in a CNN interview deriding Trump as “a faker”:

Supreme Court Justice Ruth Bader Ginsburg’s well-known candor was on display in her chambers late Monday, when she declined to retreat from her earlier criticism of Donald Trump and even elaborated on it.

“He is a faker,” she said of the presumptive Republican presidential nominee, going point by point, as if presenting a legal brief. “He has no consistency about him. He says whatever comes into his head at the moment. He really has an ego. … How has he gotten away with not turning over his tax returns? The press seems to be very gentle with him on that.” ….

“At first I thought it was funny,” she said of Trump’s early candidacy. “To think that there’s a possibility that he could be president … ” Her voice trailed off gloomily.

“I think he has gotten so much free publicity,” she added, drawing a contrast between what she believes is tougher media treatment of Democratic candidate Hillary Clinton and returning to an overriding complaint: “Every other presidential candidate has turned over tax returns.”

"That July 2016 CNN lashing of Trump was not a one-off. Justice Ginsburg made two other negative public statements about Trump during the campaign" (via Politifact): . . .