Via John Solomon of The Hill:

Congressional Republicans are seeking to make the case that the FBI’s investigation into President Trump’s campaign and possible collusion with Russia was based on flawed or politically tainted evidence connected to partisans loyal to Hillary Clinton.

The House Intelligence Committee memo spearheaded by Rep. Devin Nunes (R-Calif.) that is the talk of Washington will be at the center of the argument. The release of that four-page memo is expected as early as Friday.

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Another document — an eight-page criminal referral filed with the Justice Department by Senate Judiciary Committee Chairman Chuck Grassley (R-Iowa) and Sen. Lindsey Graham (R-S.C.) — is also part of the GOP case.

[…]

Republicans believe both documents will back up arguments that evidence used to justify the FBI’s probe came from partisans loyal to Clinton, sources said. They are also expected to play into arguments from some Republicans that special counsel Robert Mueller’s probe into Russia is based on false information.

[..]

“The fact that half to three-quarters of the evidence the FBI used to unleash the most awesome of surveillance powers upon Donald Trump’s inner circle came from sources tied directly to his Democratic opponent should worry us all, especially when that happened during an election,” said one senior Republican directly familiar with the evidence, describing the party’s core concerns.

“The FBI allowed itself to be used by Clinton partisans to parlay single-sourced, mostly unverified evidence into a counterintelligence probe with clear weaknesses that weren’t disclosed,” the source added.