In the United States, he was a central figure in the press wars between the Federalist and Democratic-Republican parties, and reported on President Thomas Jefferson's alleged children by his slave concubine Sally Hemings.
In the United States, he was a central figure in the press wars between the Federalist and Democratic-Republican parties. Callender, who was later denied employment by Jefferson, then reported on President Jefferson's alleged children by his slave concubine Sally Hemings.