In her first interview since the publication of her new tell-all memoir, Mary Trump said her uncle President Trump should resign.

Mary Trump appeared on Good Morning America to promote her book, Too Much and Never Enough: How My Family Created the World’s Most Dangerous Man, and to answer questions from ABC News anchor George Stephanopoulos.

She said that her uncle should step down from the presidency, and called him “utterly incapable of leading this country.”

“I saw firsthand what focusing on the wrong things, elevating the wrong people can do—the collateral damage that can be created by allowing somebody to live their lives without accountability,” she told Stephanopoulos. “And it is striking to see that continuing now on a much grander scale.”

She laid much of the blame for President Trump’s behavior on his father, Fred Trump Sr., whom she called a “sociopath.” Fred Trump “was incredibly driven in a way that turned other people, including his children [and] wife, into pawns to be used to his own ends,” Mary Trump said.

“It’s impossible to know who Donald might have been under different circumstances and with different parents,” she said. “But clearly he learned the lesson.”

ABC News highlighted two tweets from Eric Trump, the president’s son, who seemed to reference his cousin Mary, writing, “Every family has one…It’s usually telling when that ‘one’ stands alone.”

Michael Schaub is a Texas-based journalist and regular contributor to NPR.