Donald Trump Jr. is set to meet with members of the Senate Intelligence Committee in a closed-door session on Wednesday.

The appearance by the president’s son follows a subpoena by the GOP chairman of the committee, North Carolina Sen. Richard Burr.

Trump Jr. backed out of meeting with the committee twice before Burr decided to issue the subpoena.

One of the major issues that senators want to discuss with Trump Jr. is testimony he gave about a plan to build a Trump Tower in Moscow before the presidential election.

President Trump’s former lawyer, Michael Cohen, told a House committee in February that he had briefed Trump Jr. approximately 10 times about the project.

The panel is also interested in talking to Trump Jr. about other topics, including a campaign meeting in Trump Tower with a Russian lawyer that captured the interest of special counsel Robert Mueller.

Don Jr. allegedly set up the meeting to get “dirt” on Hilary Clinton.

The president said last month that his son was treated unfairly.

“It’s really a tough situation because my son spent, I guess, over 20 hours testifying about something that Mueller said was 100% OK and now they want him to testify again,” Trump told reporters at the White House.

“I don’t know why. I have no idea why. But it seems very unfair to me.”