Republican lawmakers are calling Supreme Court nominee Neil Gorsuch’s recent criticism of President Donald Trump a sign that he would be a fair and independent-minded judge on the nation’s highest court. But Senate Minority Leader Chuck Schumer (D-N.Y.) isn’t buying it.

In a scathing op-ed in The New York Times on Friday, Schumer wrote that Gorsuch’s private conversations with senators on Capitol Hill, in which the federal judge expressed dismay with Trump’s recent attacks on the judiciary, should not inspire confidence in his nomination.

“A truly independent judge would have the fortitude to condemn the president’s remarks, not just express disapproval, and to do it publicly,” Schumer wrote. “The White House’s assertion that Judge Gorsuch’s private remarks were not aimed at Mr. Trump only raises concerns about his independence.”

Sen. Richard Blumenthal (D-Conn.) first discussed his private conversation with Gorsuch with CNN on Wednesday. The senator revealed that Gorsuch told him Trump’s “so-called judge” tweet was “disheartening” and “demoralizing.”

Ron Bonjean, a spokesman for Gorsuch, confirmed the exchange to CNN on Wednesday. But Thursday morning, Trump took to Twitter to accuse Blumenthal of “misrepresenting” Gorsuch’s sentiments and to resurrect a criticism that the senator had implied at least once that he had served in Vietnam when in fact he had been stateside during the war.

Sen.Richard Blumenthal, who never fought in Vietnam when he said for years he had (major lie),now misrepresents what Judge Gorsuch told him?

— Donald J. Trump (@realDonaldTrump) February 9, 2017

Hours later, former Sen. Kelly Ayotte (R-N.H.), who is aiding the judge through the nomination process, released a statement claiming Gorsuch’s remarks condemned “any criticism” of a judge’s integrity and were not aimed at Trump specifically.

Sen. Ben Sasse (R-Neb.) said Thursday that Gorsuch had confided in him about Trump’s tweet as well and that the judge’s private admission should pacify Democrats skeptical of his nomination.

“Frankly, it seems to me that [Gorsuch’s criticism of Trump] is a good reason why his nomination shouldn’t be politicized,” Sasse said on MSNBC’s “Morning Joe.” “People all across the political spectrum should love the fact that he’s going to be a warrior for our constitutional system of executive restraint and limits.”

But the Senate minority leader didn’t draw the same conclusions about the nominee. Schumer wrote that Gorsuch had expressed the same concerns to him during a meeting on Capitol Hill but claimed that the judge refused to speak out publicly on the matter.

Schumer’s essay calls Gorsuch’s motives into question, implying that the judge’s quiet criticism of Trump’s actions merely serves to create the appearance of independence in order to gain the support needed from Democrats to secure his seat on the bench.

“Clearly he wanted this to be seen as a marker of his independence,” Schumer wrote, “because his handlers immediately told us, ‘You can tell this to the press.’”

Schumer’s article echoes Blumenthal’s comments, also on Thursday’s “Morning Joe,” that Gorsuch explicitly told him to “feel free to talk publicly” about their conversation.

“Judge Gorsuch must do more than just say in private, behind closed doors, that he is disheartened by these attacks,” Blumenthal said. “It has to be a public condemnation that defends the independence of the judiciary and his own independence. He has to show the American people that he will be more than just a rubber stamp for Donald Trump.”

Schumer concluded in his essay that Gorsuch had thus far failed to prove he could rule on the Supreme Court independently of his personal preferences. The Democratic senator wrote that he repeatedly asked Gorsuch about his views on several landmark court cases during their meeting but that the judge refused to answer the questions.

“The only way that Judge Gorsuch was able to demonstrate his independence as a jurist was by asserting it himself,” Schumer wrote. “He could give no evidence of it in his record, and therefore I could have no assurance of it in the future.”

Read Schumer’s op-ed in The New York Times.