Supreme Court of Justice Ruth Bader Ginsburg commented on presidential nominee Donald Trump.
"I think that it was the wrong statement, she ought to apologize for it, she ought to withdraw it", Grassley said Wednesday when asked about Trump's demand.
Don't ever get it twisted: Ruth Bader Ginsburg is a treasure on the Supreme Court and anyone who cares about civil rights for anyone should be thankful she exists.
Ginsburg, who is 83 years old, was interviewed by The New York Times earlier this week, in which she made some controversial comments about the presumptive Republican presidential nominee.
Ginsburg's remarks to CNN came after she expressed concerns about what will become of the USA if Trump is elected president in separate interviews with the New York Times and the Associated Press.
The furore over Ginsburg's comments comes as Trump prepares for the Republicans' July 18-21 convention that will formally nominate him as the party's presidential candidate for the November 8 election.
"A federal law requires all federal judges, including the justices, to recuse themselves if their "impartiality might reasonably be questioned", said Stephen Gillers, a legal ethicist at New York University School of Law.
"I think they have very precise rules within the Supreme Court of when recusal is necessary", he said. She called Donald Trump "a faker", criticized him for not releasing his tax returns (and the media for not being hard enough on him about it).
Earnest said he declined to comment further- pointing to past precedent.
The Journal then offers a list of recent "verbal eruptions" in which Ginsburg has spoke on politically tinged issues such as the confirmation of Merrick Garland or her desire to overturn the Citizens United decision which could come before the Court again in the future. She's proven herself to be the most reliable ideologue on the court. Trump's tweet has received a positive response from his supporters, with the message being "Like" over 24,000 on Twitter.
Trump quickly fired back at Ginsburg, who was appointed to the high court in 1993 by his opponent's husband, former President Bill Clinton.
Ginsburg was not immediately available for comment on Trump's remarks and the Times editorial.
"It's so beneath the court for her to be making statements like that".
Ms Ginsburg is among the liberals on the Supreme Court, which has been ideologically split with four liberals and four conservatives since the sudden death of conservative Justice Antonin Scalia in February. The code, set by the U.S. Judicial Conference, says judges should not "make speeches for a political organisation or candidate, or publicly endorse or oppose a candidate for public office".
Still, the justices typically try to stay out of the political fray. "I couldn't believe it when I saw it".