Sen. Lindsey Graham said he wants to see the manuscript of former national security adviser John Bolton’s new book after details from it were leaked to the press.

The South Carolina Republican spoke to reporters on Monday, the second day of President Trump’s impeachment team’s defense, according to the Hill. Reports on Sunday said Bolton’s forthcoming memoir claims that Trump told him Ukraine would not receive U.S. military aid until the country launched investigations into former Vice President Joe Biden and his son Hunter.