CEDAR RAPIDS — The Senate Judiciary Committee’s probe into Russian influence on the 2016 presidential election hasn’t yielded answers yet, but Sen. Chuck Grassley characterized the investigation as still in its early stages.“Not yet,” the Judiciary chairman said Tuesday when asked if the committee is making progress toward understanding whether Russian interests attempted to influence the election of President Donald Trump as well as whether they succeeded.“Nor has any other committee,” Grassley added.Whether FBI Special Counsel Robert Mueller is making progress in his criminal investigation is unknown, Grassley said, and unless there is some leak, “we won’t know until he gets done.”The Senate Intelligence Committee has taken the lead on the investigation into Russian interference and possible collusion with the Trump campaign.