"We can't do a thorough and credible investigation unless we obtain these documents -- unless we talk to these witnesses," Schiff said. An attorney for Trump Jr couldn't be reached for comment, and an Ivanka Trump attorney had no immediate comment. Schiff says the GOP should agree to subpoena for that information if Trump Jr. does not provide details to the committee. "Without getting complete phone records .. we will not get a full picture of what conversations may have taken place between the president and his son contemporaneous with the Trump Tower meeting," Schiff said. "I think it would be valuable for her to testify and come before the committee," Schiff said.

Source: CNN January 11, 2018 23:12 UTC