According to CNN, the Senate Foreign Relations Committee has already asked private companies and government agencies to preserve documents and records that could serve as evidence in future investigations.
The investigations are expected to begin in January 2027, after Democrats take control of Congress.
One of the letters was sent to SpaceX CEO Elon Musk. It specifically raises questions about restrictions on Starshield operations in Ukraine.
Similar requests were also sent to ports, banks and private companies that may have been involved in deals to supply Russian diesel fuel.
Starshield restrictions affecting Ukraine's Armed Forces: What we know
On Oct. 14, Ukrainian officials reported Starlink speed restrictions. Connections through the military-grade Starshield service were lost at speeds exceeding 160 kilometers per hour (99 mph), disrupting military missions and making it harder for interceptor drones to counter jet-powered Shahed drones.
The Telegraph reported that Elon Musk had personally initiated the restrictions.
On Oct. 23, Trump said Musk had lifted the restrictions. However, Ukrainian military personnel and President Volodymyr Zelenskyy reported that they remained in effect.
That same day, Reuters reported that Democratic Sen. Richard Blumenthal had initiated an investigation into how Ukraine lost access to Starlink communications.
On Oct. 24, Zelenskyy confirmed that Starlink and Starshield were once again operating at the same speeds as before the restrictions.
According to the Ukrainian president, service began to recover overnight, and by morning, speeds were sufficient for full operations.