President Donald Trump’s eldest son will testify Wednesday behind closed doors to a Republican-led Senate committee investigating Russia election meddling, a congressional source said. The appearance by Donald Trump Jr before the Senate Intelligence Committee follows a dispute that made headlines last month when the president expressed surprise that his son was being hauled before Congress for a second time as part of the panel’s probe. Trump Jr, the 41-year-old currently at the helm of the Trump Organization, is expected to be questioned beginning around 9:15 am (1315 GMT), the source familiar with the proceedings said Tuesday.