House Intelligence Committee Chairman Adam Schiff said special counsel Robert Mueller would be making a “mistake” if President Trump isn’t brought in to testify under oath for the federal investigation into Russian interference in the 2016 election and possible collusion between the Trump campaign and the Kremlin.

Speaking to Chuck Todd on NBC’s “Meet the Press,” Schiff, D-Calif., said that he hopes Mueller subpoenas Trump or finds a way to get him in front of a grand jury. Mueller hasn’t done so yet, and reports indicate that his efforts are winding down and a final report may soon be incoming to the Justice Department.