Both Trump Jr. and Manafort have come under scrutiny following revelations that they attended a June 2016 meeting in Trump Tower with a Russian attorney and at least five other people.

According to emails released by Trump Jr., the prospect of potentially damaging information about 2016 Democratic presidential nominee Hillary Clinton was touted as a reason for the meaning. But Trump Jr. later said the focus of the meeting turned to Russian adoptions.

Meanwhile, President Trump’s son-in-law and adviser, Jared Kushner, who also attended the meeting in Trump Tower, is scheduled to appear before the Senate Intelligence Committee on Monday and the House Intelligence Committee on Tuesday, in connection with their Russia probes.