Senators on the Senate Armed Services Committee have asked the Pentagon for information about SpaceX CEO Elon Musk, including whether he ever had authority to “direct or impede the operation of Starlink satellite communications terminals used by the Ukrainian Armed Forces in southern Ukraine in 2022.”

Sens. Jeanne Shaheen of New Hampshire, Elizabeth Warren of Massachusetts, and Tammy Duckworth of Illinois wrote to Defense Secretary Lloyd Austin on Friday expressing their serious concerns about Musk intervening personally to undermine a key U.S. partner at a crucial time.

The questions follow the publication of a biography of Elon Musk, who is the CEO of SpaceX and Tesla as well as owner and chief technology officer of X, formerly known as Twitter. A Ukrainian drone submarine attack on Russian warships was disrupted by a disconnect from Starlink, ordered by Musk, according to Walter Isaacson’s book.

Senators on the Senate Armed Services Committee have asked the Pentagon for information about SpaceX CEO Elon Musk, including whether he ever had authority to “direct or impede the operation of Starlink satellite communications terminals used by the Ukrainian Armed Forces in southern Ukraine in 2022.”

Sens. Jeanne Shaheen of New Hampshire, Elizabeth Warren of Massachusetts, and Tammy Duckworth of Illinois wrote to Defense Secretary Lloyd Austin on Friday expressing their serious concerns about Musk intervening personally to undermine a key U.S. partner at a crucial time.

The questions follow the publication of a biography of Elon Musk, who is the CEO of SpaceX and Tesla as well as owner and chief technology officer of X, formerly known as Twitter. A Ukrainian drone submarine attack on Russian warships was disrupted by a disconnect from Starlink, ordered by Musk, according to Walter Isaacson’s book.

In Washington, among NATO allies, and in Kiev, excerpts from the book raised alarm bells. According to Musk, he did not disconnect Starlink over Crimea, but rather denied a request to provide it there by Ukraine after they were published. In his letter, he wrote, “If I had agreed to their request, SpaceX would have been explicitly complicit in war and conflict escalated.” Isaacson has corrected his biography to state that connectivity had already been disabled in the affected area and that Musk had simply refused to turn it on.

The CEO also advocated for a “truce” between Ukraine and Russia, as he has in the past. The “peace plan” argument by Musk was shouted down by Ukrainian officials, politicians and Putin experts.

Isaacson discussed SpaceX building a military-grade version of Starlink in an interview with “Squawk Box” on Tuesday, in response to Musk’s concerns.

The CEO also advocated for a “truce” between Ukraine and Russia, as he has in the past. The “peace plan” argument by Musk was shouted down by Ukrainian officials, politicians and Putin experts.

Isaacson discussed SpaceX building a military-grade version of Starlink in an interview with “Squawk Box” on Tuesday, in response to Musk’s concerns.