Republicans are continuing to delete mention of the FBI informant on which they based their impeachment investigation.

Ian Sams, White House spokesman for oversight and investigations, noticed that 'evidence" listed on the House Republican Oversight and Reform Committee's Biden impeachment website is disappearing.

The list now on the website is different from a back-dated one on the "Wayback Machine" which mentions the report from an FBI informant — which is now missing.

That informant, Alexander Smirnov, has been accused of lying over information he gave to the FBI about a $5 million bribe he said Biden took. The Department of Justice has suggested that Smirnow's information came from Russian intelligence.

Republicans have also been deleting reference to Smirnov elsewhere. GOP members in the House Oversight and Reform and Judiciary Committees killed a full paragraph about Smirnov in a letter to former State Department official Amos Hochstein, despite the mention being in an earlier draft.

ALSO READ: How Donald Trump is spreading a dangerous mental illness to his supporters

Smirnov had been lauded as a star witness in the GOP's case against Biden, which alleges that Biden scored the bribe from a Ukrainian company that had hired his son Hunter onto its board.

Republicans were relying heavily on Smirnov's testimony to prove the bribery scheme. They claimed that Smirnov’s account was critical to their investigation and fought with the FBI over obtaining the information. Once they finally obtained the documentation, they moved to the impeachment inquiry into Biden. See the screen captures below.

Several experts have suggested Republicans involved in the Biden probe should be investigated for their part in pushing Smirnov's testimony.