A federal judge threw cold water on one of Alphabet’s key arguments in a Department of Justice lawsuit over allegations that Google monopolized advertising technology.

During closing arguments in the lawsuit against the tech giant, U.S. District Judge Leonie Brinkema said that she disagreed with Google’s attempts to rely on an earlier antitrust case involving American Express. The judge interrupted Google’s lawyer Monday to say that she had carefully studied a 2018 Supreme Court decision in the older case.

"We’re dealing with a completely different setup” here compared to Amex, she said on the closing day of the trial in Alexandria, Virginia.