Kaelan Deese writes for the Washington Examiner about an interesting development in Senate Democrats’ attack on the U.S. Supreme Court.

If Senate Democrats plan to subpoena conservative judicial activists as part of a Supreme Court ethics investigation, Republicans say they must go after liberal advocates the same way.

Senate Judiciary Committee Chairman Dick Durbin (D-IL) has sought to authorize subpoenas for influential conservative judicial activist Leonard Leo and GOP megadonor Harlan Crow, defending the subpoenas as necessary after the pair’s “defensive, dismissive refusals” to cooperate with a congressional investigation. Now, Republicans have proposed more than 150 additional subpoenas to broaden an investigation they say is one-sided against conservative justices on the high court.

The Washington Examiner obtained copies of amendments that Republicans want added to the proposal to subpoena Leo and Crow. Sen. Marsha Blackburn (R-TN) previously brought up one major amendment was by demanding subpoenas for Democratic-appointed Justice Sonia Sotomayor’s staff and book publisher.

“What we learned was that over the years, her staff has pressured public institutions to buy her books,” Blackburn said before the vote to subpoena Crow and Leo fell apart on Nov. 9, saying Democrats were engaging in an “assault on the legitimacy of the Supreme Court.”

Sotomayor partook in two separate copyright infringement cases concerning publishing conglomerate Penguin Random House, failing to recuse from a case that involved her book publisher. Her court staff also reportedly pressured colleges and libraries to purchase more of her books, from which she has earned nearly $4 million since she joined the court in 2009, according to the Associated Press.

Durbin postponed the Nov. 9 planned vote to authorize the subpoenas after Republicans on the panel filed dozens of amendments to put other wealthy liberal advocates in the lineup, including Blackburn’s proposal. The committee once again did not vote on the subpoenas after Durbin canceled last Thursday’s meeting ahead of the Thanksgiving holiday, with no clear indication of when the next vote would be called.