Sen. Sheldon Whitehouse sharply criticized congressional oversight of the Trump administration on Thursday, calling the Senate Judiciary Committee’s probe less than thorough and questioning whether House members may have engaged in obstruction of justice.

“We have not done nothing in the Senate Judiciary Committee, and I appreciate that,” the Rhode Island Democrat said in a measured tone during a committee meeting. “But we are a long way from the Senate Judiciary Committee having real answers on important questions that go to the heart of our committee’s oversight responsibilities.”

Whitehouse proposed that the panel start with a bipartisan effort to answer just three questions that he said remain “unanswered or unasked.” His comments come in the wake of President Donald Trump’s former personal lawyer pleading guilty to campaign finance charges that implicate the president’s involvement.

First, the committee has not asked for an accounting of Trump businesses’ dealings with and obligations to Russian interests, Whitehouse said.

Second, the committee has not pursued whether Donald Trump Jr. gave false testimony to the committee in September 2017 about a meeting with Russian lawyer Natalia Veselnitskaya at Trump Tower in June 2016.