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Rand Paul blocks resolution calling for Mueller report release
https://thehill.com/homenews/senate/436293-rand-paul-blocks-resolution-calling-for-mueller-report-release
Did you read the article?
Paul objected because Klobuchar wouldn't agree to amend the nonbinding resolution to include provisions calling for the public release of communications between several Obama-era officials including former President Obama, former FBI Director James Comey and former CIA Director John Brennan.
"We need to know was there malfeasance, was there misuse of power, did President Obama's administration get involved in an election to infiltrate the Trump campaign to trap them? … We need to know that," he said. "What we need to discover and we do not yet know: Was President Obama involved?"
Under Senate rules, any one senator can request that any bill or resolution be passed. But because it requires the sign-off of every senator, any one senator can also block their request.