Sen. John McCain John Sidney McCainAnalysis: Biden victory, Democratic sweep would bring biggest boost to economy The Memo: Trump's strengths complicate election picture Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' MORE (R-Ariz.) has heard the criticism about his line of questioning to former FBI Director James Comey, and he gets it.

“I get the sense from Twitter that my line of questioning today went over people’s heads," McCain said on Twitter. "Maybe going forward I shouldn’t stay up late watching the Diamondbacks night games.”

McCain left people scratching their heads as he asked Comey questions about differences in how he handled probes into Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE and Donald Trump during the presidential campaign.

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Comey himself seemed a bit confused as he sought to answer questions from McCain, the last senator interrogating him in a nearly four-hour hearing. In trying to answer McCain, Comey said the Clinton investigation ended in June, while the Russia election hacking investigation was ongoing.

"I was saying that in the case of the investigation of former Secretary [of State] Clinton's involvement, he examined it, said it was over and it was done," McCain told CNN after the hearing. "In the case of President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE's involvement, there's more shoes to drop, there's more investigations. What's the difference? It's over the same issue. That was the question I was trying to get at. I obviously didn't do it very well."

“I wanted Mr. Comey to apply the same approach to the key question surrounding his interactions with President Trump—whether or not the President’s conduct constitutes obstruction of justice," McCain separately said in a statement. "While I missed an opportunity in today’s hearing, I still believe this question is important, and I intend to submit it in writing to Mr. Comey for the record.”