Representative Adam Schiff said today that Republicans have declined to invite many witnesses that would be valuable to the probe, including Ivanka Trump and several people who he says have additional information about a June 2016 meeting between Russians and the Trump campaign.
"There are witnesses who have knowledge of the Trump Tower meeting and what it was about prior to the meeting that have not been brought before our committee," Schiff told reporters.
The Los Angeles Times reported last week that Ivanka Trump talked to at least two of the meeting's participants on the way out.
"I think that if there's credible information that Ivanka Trump had contact with any participants in that meeting, at the time of the meeting, that she should be brought in," Schiff said. "She may have more valuable insights on a variety of other issues as well."
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He laid the blame on House intelligence committee chairman Devin Nunes, R-Calif, who stepped aside from the probe for several months while the House Ethics Committee investigated whether Nunes had at one point divulged classified information.
Schiff said he and Texas Rep. Mike Conaway, who has led the probe since Nunes stepped aside, have "tried to keep the investigation on track," but "the chairman has a different agenda."
Republicans have in turn criticised Democrats for trying to draw out the probe and say there's no clear evidence of collusion between Trump and Russia. They have indicated they want the investigation to wind down in the early months of this year.