Attorney General Jeff Sessions was pressed by House Democrats Tuesday on new questions about Russian contacts with Donald Trump's presidential campaign — and by Republicans on almost anything but that.

Sessions appeared as the House Judiciary Committee began an ostensibly routine oversight hearing that wasn't routine at all. Instead, it highlighted a growing, and perhaps insurmountable, partisan dispute over the Russia investigation by special counsel Robert Mueller and Trump-backed demands to reopen past inquiries into Hillary Clinton, his campaign opponent.

The Democratic questioning of Sessions, to be led by Jerrold Nadler of New York, is turning on revelations by Mueller that appeared to undercut Sessions's sworn testimony at his Senate confirmation hearing in January that he "wasn't aware" of anyone in Trump's campaign making contact with Russians.