The Trump campaign’s defamation lawsuit against the Washington Post over opinion columns about foreign election interference may face its end in D.C. trial court, after attorney Charles Harder faced repeated questions from the judge about whether the targeted writings reached the legal threshold needed for the complaint to survive.

The campaign sued the Washington Post over pieces by Greg Sargent and Paul Waldman, alleging the writers knowingly made false statements about the Trump campaign’s ties to foreign countries. Sargent wrote that Mueller “concluded that Trump and/or his campaign eagerly encouraged, tried to conspire with, and happily profited” off the Russian election interference in 2016.