WASHINGTON — Sen. John Curtis, a Utah Republican, is asking the Senate Judiciary Committee to subpoena Donald Trump Jr. and former President Joe Biden’s son Hunter Biden over their foreign business relationships, gifts and other benefits tied to their family connections to the presidency. Curtis made the request in a Sept. 21 letter to Judiciary Chair Chuck Grassley, R-Iowa, and the committee’s senior Democrat, Sen. Dick Durbin of Illinois. The letter followed reporting that Russian oligarch Umar Kremlev paid for elements of a wedding-related celebration involving Trump Jr. Curtis said the committee should question Trump Jr. about his dealings with foreign business figures, his promotion of family cryptocurrency ventures, international real estate efforts and reported investments in defense contracting. He described the concerns as part of a larger question about whether relatives of presidents can profit from access to political power. “Questions have arisen about the relationships of President Trump’s eldest son, Donald Trump Jr., with foreign business figures and the acceptance of significant gifts,” Curtis wrote. Kremlev is president of the International Boxing Association and received Russia’s Order of Friendship medal from President Vladimir Putin for contributions to international sport. Ukraine has sanctioned Kremlev over his ties to Putin. Reporting cited by Curtis said Kremlev traveled to China with a delegation accompanying Putin shortly before providing the wedding-related gift. President Donald Trump has rejected the account. He said he does not know Kremlev and disputed that the oligarch paid for his son’s wedding, saying the event took place at a different location and on a different day. The White House did not immediately respond to a request for comment on Curtis’ letter. A spokesperson for Judiciary Committee Republicans confirmed that Grassley had received it but said the panel could not commit to an investigation. The spokesperson cited a crowded schedule through the end of 2026 and said investigative hearings typically require months of preparation. Curtis also requested testimony from Hunter Biden about his business dealings, foreign relationships and any benefits he received. Hunter Biden has faced years of scrutiny from Republicans over his overseas business activities, while Democrats have accused Republicans of selectively targeting members of President Trump’s family. Curtis said Congress should not change its standards depending on which party controls the White House. “The country should not have to accept one standard for the family of a Republican president and another for the family of a Democratic president,” he wrote. “Nor should congressional oversight begin and end when control of the White House changes hands.” The request places Curtis at odds with a president who has demanded loyalty from congressional Republicans, even as Curtis framed the matter as a bipartisan ethics inquiry rather than a partisan investigation. The issue could gain momentum if Democrats win control of either chamber in the 2026 midterm elections. Rep. Robert Garcia of California, the top Democrat on the House Oversight and Government Reform Committee, has already sought information from the White House and Trump Jr. about his ties to Kremlev.