The top Democrat on the House Intelligence Committee said Wednesday that former White House chief strategist Steve Bannon and former Trump campaign manager Corey Lewandowski may face subpoenas if they keep refusing to answer lawmakers’ questions.

In a statement, Rep. Adam Schiff, D-Calif., said Bannon’s lawyers have told House Intelligence that the White House will not allow him to answer questions stemming from his time on Trump’s transition team or about his work during and after his time in the administration.