A handful of Republican operatives close to the White House are scrambling to Trump Jr.’s defense and have begun what could be an extensive campaign to try to discredit some of the journalists who have been reporting on the matter.

Their plan, as one member of the team described it, is to research the reporters’ previous work, in some cases going back years, and to exploit any mistakes or perceived biases. They intend to demand corrections, trumpet errors on social media and feed them to conservative outlets, such as Fox News.