Democrats are seizing on former national security adviser John Bolton’s new book to shield their presumptive nominee Joe Biden from attacks on his China record and turn the issue around on President Trump.

Even polls that show Trump trailing Biden in the presidential race often find pluralities prefer the president to confront China, second only to his advantage on jobs and the economy. The Trump campaign has seen data that suggest its “Beijing Biden” jibes could be effective in the fall campaign. The former vice president’s supporters would like to blunt those charges and sense Bolton has given them some new ammunition.