Sen. Rand PaulRandal (Rand) Howard PaulCNN catches heat for asking candidates about Ellen, Bush friendship at debate Overnight Defense — Presented by Boeing — Trump isolated amid Syria furor | Pompeo, Pence to visit Turkey in push for ceasefire | Turkish troops advance in Syria | Graham throws support behind Trump's sanctions Rand Paul rips Lindsey Graham: 'Wrong about almost every foreign policy decision' MORE (R-Ky.) blocked a resolution calling for special counsel Robert MuellerRobert (Bob) Swan MuellerFox News legal analyst says Trump call with Ukraine leader could be 'more serious' than what Mueller 'dragged up' Lewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network 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 WarnerYang compares U.S. election tampering to Russia's election interference efforts Mark Warner nominates Bryan Cranston to play him in a movie Zuckerberg defends meetings with conservative politicians, pundits 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 ComeyComey says he has a 'fantasy' about deleting his Twitter account after end of Trump term We need answers to questions mainstream media won't ask about Democrats Trump 'constantly' discusses using polygraphs to stem leaks: report MORE and former CIA Director John BrennanJohn Owen BrennanKrystal Ball defends praise of Yang: I am not 'a Russian plant' We need answers to questions mainstream media won't ask about Democrats Former Reagan official rips Republicans for backing Trump: 'It's like the invasion of the body snatchers' MORE.
  
Paul argued that Congress still needs to figure out the "entire story" including the origins of the investigation into President TrumpDonald John TrumpWarren defends, Buttigieg attacks in debate that shrank the field Five takeaways from the Democratic debate in Ohio Democrats debate in Ohio: Who came out on top? 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 ClintonWarren defends, Buttigieg attacks in debate that shrank the field Democrats fear Ohio slipping further away in 2020 Poll: Warren leads Biden in Maine by 12 points 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 BarrGiuliani says he won't comply with subpoenas from Democrats Barr bemoans 'moral upheaval' that has brought 'suffering and misery' Trump threatens to sue Schiff and Pelosi 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 McConnellTrump-GOP tensions over Syria show signs of easing Trump again vetoes resolution blocking national emergency for border wall Trump invites congressional leaders to meeting on Turkey 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 GrahamTrump-GOP tensions over Syria show signs of easing Trump invites congressional leaders to meeting on Turkey Graham opens door to calling Hunter Biden to testify 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 SchumerTrump defends 'crime buster' Giuliani amid reported probe Louisiana voters head to the polls in governor's race as Trump urges GOP support Trump urges Louisiana voters to back GOP in governor's race then 'enjoy the game' 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.