Why it matters: The House impeached Trump for allegedly abusing his power to coerce Ukraine to investigate his political rivals. Graham’s suggestion that the Justice Department may now be receiving information on the Bidens from Giuliani — whose activities in Ukraine helped set off the impeachment inquiry — would be a significant development.

Graham also said on “Face the Nation” that while he intends to look into potential conflicts of interest involving Joe and Hunter Biden’s activities in Ukraine, he’s “not going to be the Republican Christopher Steele” — referring to the British operative whose dossier about the Trump campaign played a leading role in the 2016 Russia investigation.

Graham said that any information coming from Ukraine could be Russian disinformation, which is why Giuliani should turn it over to the Justice Department for vetting. The department did not immediately respond to a request for comment.