The Pentagon’s investigation of Sen. Mark Kelly over a video that urges American troops to defy “illegal orders” has raised a slew of questions, and some criticism, from legal experts.

Some say the Pentagon is misreading military law to go after Kelly as a retired Navy fighter pilot. Others say the Arizona Democrat cannot be prosecuted as a member of Congress. A group of former military prosecutors insists he did nothing wrong.

The Pentagon announced the investigation last week after Donald Trump’s social media post accusing Kelly — and the five other Democratic lawmakers in the video — of sedition “punishable by DEATH.”