Donald Trump Jr. is expected to arrive on Capitol Hill, Wednesday morning, in order to give testimony in a closed-door session before the Senate Intelligence Committee. The committee, chaired by Sen. Richard Burr (R-N.C.), subpoenaed Donald Trump Jr. to answer questions related to President Trump’s potential connections to Russia.

Trump Jr. had reached a deal with the committee last month to be interviewed for between two and four hours on a half-dozen topics agreed upon in advance. He is likely to face questions pertaining to a meeting he allegedly attended in June 2016 at Trump Tower, during which a Russian lawyer is believed to have offered to deliver incriminating information against Hillary Clinton.

The Intelligence Committee is also expected to question Trump Jr. further about conversations he may have had with the president regarding Trump Tower Moscow, a proposed real estate project to develop a Trump skyscraper in Russia’s capital. Trump’s organization reportedly had interest in developing a skyscraper in Moscow as early as 1978. While the project never moved forward, it has drawn attention amid investigations into Russian interference in the 2016 election.

Wednesday’s session is part of the Senate Intelligence Committee’s own independent investigation into President Trump’s connections to Moscow. The investigation has been running for two years and has reportedly interviewed some of the same witnesses who spoke to special counsel Robert Mueller III’s investigative team. President Trump’s son-in-law Jared Kushner has also answered questions before the Senate Committee on two separate occasions.

This will be the second time that Trump Jr. has testified before the committee. In 2017, he told the committee that he was only “peripherally aware” of the Trump Tower Moscow project. However, Michael Cohen, the president’s former personal attorney, testified in February of this year that Don Jr. and Ivanka Trump had been briefed multiple times about the project.

Cohen is currently serving a three-year prison sentence for financial crimes.