(CNN) House Democrats on Friday released new documents from indicted Rudy Giuliani associate Lev Parnas ahead of the Senate trial that includes new information about the apparent surveillance of former US Ambassador Marie Yovanovitch and additional contacts between Parnas and an aide to Rep. Devin Nunes of California.

The new documents add to the growing trove of allegations and evidence that have come from Ukrainian-American businessman Lev Parnas this week. Democrats have released three sets of Parnas documents this week after his attorney provided materials to the committee last weekend, and Parnas did television interviews with CNN and MSNBC in which he implicated Trump and said the efforts were "all about 2020."

The new documents include screenshots of undated text messages that appear to show Robert Hyde, a Republican congressional candidate in Connecticut, messaging with a foreign number from Belgium, which appear to describe efforts to surveil Yovanovitch. Hyde appeared to share the screenshots with Parnas, which is how they wound up on his phone that he turned over to House investigators.

The Belgian country-code number sends Hyde a screenshot of an official photo of Yovanovitch. The Belgium number, whose identity is not known, writes "My contacts are checking," adding, "I will give you the address next week."

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