Washington: Robert Mueller said Wednesday he did not exonerate Donald Trump in his two-year Russian meddling investigation but also told lawmakers he will not say if the president committed a crime, as he launched into a marathon day of congressional testimony.

Three months after releasing the final report on his probe into the 2016 election, much of the American public remains unclear about the former special counsel's findings on whether Trump criminally obstructed justice and whether his campaign colluded with Russians.