In a letter sent to Texas Gov. Greg Abbott on Thursday, the U.S. Department of Justice said that the agency plans to sue over his buoy barrier along the Rio Grande, according to the Express-News. According to the letter obtained by Hearst Newspapers, the DOJ claims that the barrier is unlawful and presents human rights concerns. “This floating barrier poses a risk to navigation, as well as public safety, in the Rio Grande River, and it presents humanitarian concerns,” the letter said.