Washington DC - have concluded an investigation into the conservative-majority Supreme Court and issued a report detailing alleged unethical behavior by justices.

On Saturday, the Senate Judiciary Committee regarding their 20-month investigation titled "An Investigation of the Ethics Challenge at the Supreme Court."

The committee says the 95-page document "sheds light on a Supreme Court facing record-low levels of public trust, a consistent stream of ethical lapses, and repeated failures by the justices – under the leadership of Chief Justice John Roberts – to address the Court's ethical challenges."

Most of the key findings point to previous reports regarding justices – in particular Thomas Alito and – having received lavish gifts from wealthy benefactors and repeatedly refusing to disclose them, as is required by federal law.

Senate Majority Whip Dick Durbin, who chairs the committee, said, "The highest court in the land can't have the lowest ethical standards."

Last year, the court adopted its first-ever , but it was not made to be enforceable in any way.

The committee requests that Congress establish an enforceable code of conduct "due to the Court's abdication of its ethical responsibilities to do so."