Russia investigations

Lawyers working with a team led by special counsel Robert Mueller approached the Senate intelligence committee this summer with a request: They wanted the transcript of an interview Senate staff had conducted with former Trump campaign chairman Paul Manafort.

But they were blocked. Manafort's lawyers said they had not authorized Mueller's legal team to access the interview transcript under the agreement with the committee, even though Mueller's attorneys said they had been given permission. The matter is still under discussion, sources say.

The previously undisclosed fight, described to CNN by multiple sources, underscores the new challenges as congressional committees and Mueller's operation head into a more intense phase of their parallel -- and sometimes, conflicting -- investigations into Russian election meddling and any collusion with Trump associates.

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