WASHINGTON — The Secret Service says it checked again and still can’t find any records that identify visitors to President Biden’s Delaware residences — where he has spent roughly one-fourth of his presidency — outraging Republicans and prompting one congressman to say “the stonewalling and gaslighting must stop.” The agency made the baffling claim in its denial of a Freedom of Information Act appeal from The Post. Secret Service deputy director Faron Paramore wrote in a letter dated Sept. 27 that “the agency conducted an additional search of relevant program offices for potentially responsive records.” “This search also produced no...