Sen. Rand PaulRandal (Rand) Howard PaulGraham promises ObamaCare repeal if Trump, Republicans win in 2020 Conservatives buck Trump over worries of 'socialist' drug pricing Rand Paul to 'limit' August activities due to health MORE (R-Ky.) blocked a resolution calling for special counsel Robert MuellerRobert (Bob) Swan MuellerMueller report fades from political conversation Trump calls for probe of Obama book deal Democrats express private disappointment with Mueller testimony MORE's report on the Russia probe be made public, marking the fifth time Republicans have blocked the House-passed measure.
 
Sen. Mark WarnerMark Robert WarnerLawmakers sound alarm on China's disinformation campaign in Hong Kong Facebook users in lawsuit say company failed to warn them of known risks before 2018 breach New intel chief inherits host of challenges MORE (D-Va.), the vice chairman of the Senate Intelligence Committee, asked for unanimous consent on Thursday to pass the resolution, which cleared the House in a 420-0 vote earlier this year. 
 
"What we're talking about is basic transparency, let's make sure the full Mueller report is released to Congress … and then let's make sure the American people see as much of this report as possible," Warner said from the Senate floor. 
 
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He added that to warn future campaigns and candidates about potential election interference "we need to fully understand what the Russians were trying to do."
 
Under Senate rules, any one senator can request that any bill or resolution be passed. But because it requires the signoff of every senator, any one senator can also block their request.  
 
Paul objected because Warner wouldn't agree to amend the nonbinding House-passed resolution to include provisions calling for the public release of communications between several Obama-era officials including former President Obama, former FBI Director James ComeyJames Brien ComeySarah Huckabee Sanders becomes Fox News contributor 3 real problems Republicans need to address to win in 2020 Barr predicts progressive prosecutors will lead to 'more crime, more victims' MORE and former CIA Director John BrennanJohn Owen BrennanWebb: Questions for Robert Mueller A brief timeline of Trump's clashes with intelligence director Dan Coats Trump critic Brennan praises his Iran decision: I 'applaud' him MORE.
  
Paul argued that Congress still needs to figure out the "entire story" including the origins of the investigation into President TrumpDonald John TrumpSarah Huckabee Sanders becomes Fox News contributor The US-Iranian scuffle over a ship is a sideshow to events in the Gulf South Korea: US, North Korea to resume nuclear talks 'soon' MORE's campaign and a controversial research dossier compiled against then-candidate Trump. 
 
"I think it's very important that we not turn our country into this back and forth where each successive party tries to use the apparatus of government to investigate the previous president," Paul said. 
 
"What we don't know is was President Obama told that the evidence to get this investigation started was paid for by the Hillary ClintonHillary Diane Rodham ClintonPoll shows Biden, Warren tied with Trump in Arizona The Hill's Morning Report - Trump touts new immigration policy, backtracks on tax cuts Hickenlooper announces Senate bid MORE campaign? We need to know that," Paul continued. 
 
Paul has warned that he would block the resolution backing the Mueller report's release unless information about the opposition research dossier compiled against Trump was also released. He first blocked the House-passed resolution last week. 
 
"It was so scandalous and so unverified and has turned out to be untrue, and yet this was the basis for the beginning of the investigation. This was the basis for doing something extraordinary," Paul added on Thursday of the dossier. 

A 2018 memo from the House Intelligence Committee, which was controlled at the time by Republicans, found that the FBI's counterintelligence investigation into whether Trump campaign officials had improper contacts with Russia was triggered by information the bureau obtained about George Papadopoulos, a former adviser to the campaign. 

Thursday's floor drama comes after The New York Times reported that some members of Mueller's team believe the four-page letter from Attorney General William BarrWilliam Pelham BarrBarr says he has seen 'nothing' to undercut Epstein autopsy findings Prosecutors are mainly to blame for the criminal justice crisis The Hill's Morning Report - Trump hews to NRA on guns and eyes lower taxes MORE that summarized the principal conclusions didn't sufficiently portray their findings, which they suggested could be more damaging to Trump than Barr conveyed.
 
It marks the fifth time Democrats have tried to pass the House resolution, which says there is “overwhelming public interest” in the government releasing the contents of the high-profile Mueller report. The resolution calls on the Justice Department to fully release the report to Congress and to release it to the public “except to the extent the public disclosure of any portion thereof is expressly prohibited by law.”
 
Mueller handed over his report to the Justice Department, marking the formal end to his two-year investigation. Barr is expected to testify on the report early next month.
 
In addition to Paul, Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellMcConnell rejects Democrats' 'radical movement' to abolish filibuster Hickenlooper announces Senate bid Trump orders elimination of student loan debt for thousands of disabled veterans MORE (R-Ky.) has twice blocked the House resolution from being passed, arguing that Barr is currently working with Mueller to determine what from the report can be released. 
 
Sen. Lindsey GrahamLindsey Olin GrahamGOP group calls on Republican senators to stand up to McConnell on election security in new ads Cindy McCain says no one in Republican Party carries 'voice of reason' after husband's death Trump says he'll decide on foreign aid cuts within a week MORE (R-S.C.), the chairman of the Senate Judiciary Committee, has also blocked the House-passed resolution.
 
Graham voiced opposition to the resolution, citing Senate Minority Leader Charles SchumerCharles (Chuck) Ellis SchumerJewish Democratic congresswoman and veteran blasts Trump's 'disloyalty' comments Schumer says Trump encouraging anti-Semites Saagar Enjeti: Biden's latest blunder; Krystal Ball: Did Schumer blow our chance to beat McConnell? MORE's (D-N.Y.) refusal to amend it to include a provision calling on the Justice Department to appoint a special counsel to investigate alleged department misconduct in the handling of the investigation into 2016 Democratic candidate Hillary Clinton's email use and the Foreign Intelligence Surveillance Act applications related to Trump campaign adviser Carter Page.