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. 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...