Donald Trump Jr. has hired a lawyer to represent him in Russia-related investigations, his office and the lawyer said on Monday, as Republicans voiced concern about a meeting between the U.S. president’s son and a Russian.

Trump Jr. hired New York lawyer Alan Futerfas, who specializes in criminal defense.

Futerfas would not say when he was retained or whether he played any part in the statements Trump Jr. made over the weekend about a meeting with a Russian lawyer.

Trump Jr. met the lawyer, Natalia Veselnitskaya, in June 2016 during the presidential election campaign at Trump Tower in New York.

Trump‘s son-in-law Jared Kushner and Trump‘s then-campaign chairman, Paul Manafort, also attended, the New York Times said. It called the encounter the first confirmed private meeting of members of Donald Trump‘s inner circle with a Russian national.

Congressional committees and a federal special counsel, Robert Mueller, are investigating whether Russia interfered in the election and colluded with the Trump campaign.

Moscow denies interfering, and Trump, who became president on Jan. 20, says there was no collusion.

Trump Jr. has said he agreed to meet Veselnitskaya, described by the Times as having links to the Kremlin, after being promised damaging information about Democratic presidential candidate Hillary Clinton.

Futerfas told Reuters: “I look forward to assisting Donald Jr. and, quite frankly, there is nothing to all of the media buzz about the June 9th, 2016 meeting. That will be proven to be the case.”

Earlier on Monday, a Republican member of the U.S. Senate Intelligence Committee, Susan Collins, called on Donald Trump Jr. to testify before the panel, which is looking into accusations of Russian meddling in the election.

Get our Politics Newsletter. The headlines out of Washington never seem to slow. Subscribe to The D.C. Brief to make sense of what matters most. Please enter a valid email address. Sign Up Now Check the box if you do not wish to receive promotional offers via email from TIME. You can unsubscribe at any time. By signing up you are agreeing to our Terms of Use and Privacy Policy . This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Thank you! For your security, we've sent a confirmation email to the address you entered. Click the link to confirm your subscription and begin receiving our newsletters. If you don't get the confirmation within 10 minutes, please check your spam folder.

Contact us at letters@time.com.