Twitter chief executive Jack Dorsey phoned Democratic Rep. Ilhan Omar on Tuesday and stood by the company’s decision to permit a tweet from President Trump that later resulted in a flood of death threats targeting the congresswoman.

The previously unreported call focused on an incendiary video that Trump shared on April 12, which depicts Omar discussing the Sept. 11, 2001, attacks interspersed with footage of the Twin Towers burning. The clip did not include the full context of Omar’s remarks, which were taken from a public event on the broader issue of Islamophobia.

Omar pressed Dorsey to explain why Twitter didn’t remove Trump’s tweet outright, according to a person familiar with the conversation who spoke on condition of anonymity because the call was private. Dorsey said that the president’s tweet didn’t violate the company’s rules, a second person from Twitter confirmed.