Stanford Law School professor Pamela Karlan on Wednesday told House impeachment investigators that the “most chilling” evidence that President Donald Trump was pursuing his own political gain in Ukraine came from the November 20 testimony of Gordon Sondland, the U.S. Ambassador to the European Union.

Karlan, one of four legal scholars to testify during Wednesday’s Judiciary Committee hearing, said she spent her entire Thanksgiving break reading transcripts from previous public impeachment hearings in the House Intelligence Committee.

The “most striking” line from the witness testimony, said Karlan, was Sondland’s claim that Trump did not care whether Ukrainian President Volodymyr Zelensky actually opened an investigation into former Vice President Joe Biden.

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