Uber CEO Travis Kalanick has apologized for using an anti-Semitic slur on Twitter in a tweet last month, a company spokesman said Monday.

Kalanick said the tweet was meant as a joke.

The Uber board met on Monday to discuss the apology, the spokesman said.

The apology comes after Uber’s board voted unanimously Monday to suspend Kalanicks employment and the company’s board of directors voted to fire him.

Uber CEO Travis Balzer resigned in March after a probe found he mishandled sexual harassment claims against female employees and misappropriated funds for his personal use.

The board also voted to approve an internal investigation into allegations against Kalanicky by former female employees, including his wife, former partner, and his former assistant, among others.

The board said it will also hold a hearing on the allegations.