Sen. Lindsey Graham (R-SC) argued that he will consider any impeachment “invalid” unless it exposes the identity of the whistleblower who outed President Donald Trump’s alleged extortion of Ukraine.

While speaking to Fox News host Maria Bartiromo, Graham suggested that the Senate does not have to fulfill its constitutional obligations to try the president if the House impeachment is deemed “invalid.”

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Graham praised Republicans in the House who have called on both the whistleblower and Hunter Biden, the son of former Vice President Joe Biden, to testify.

“I consider any impeachment in the House that doesn’t allow us to know who the whistleblower is to be invalid,” the South Carolina senator declared. “Because without the whistleblower complaint, we wouldn’t be talking about any of this.”

“I also see the need for Hunter Biden to be called to adequately defend the president,” he added. “And if you don’t do those two things, it’s a complete joke.”

House Democrats have argued that the whistleblower’s identity does not need to be exposed because the complaint against Trump has been corroborated by witnesses who have come forward.

Watch the video below from Fox News.