WASHINGTON — Vice President Mike Pence plans to maintain an aggressive campaign schedule this week despite his exposure to a top aide who tested positive for the coronavirus, the White House said Saturday. Pence himself tested negative, his office said. Under Centers for Disease Control and Prevention criteria, the vice president is considered a “close contact” of his chief of staff, Marc Short, but will not quarantine, said spokesman Devin O’Malley. O’Malley said Pence decided to maintain his travel schedule “in consultation with the White House Medical Unit” and “in accordance with the CDC guidelines for essential personnel.” Those guidelines require that essential workers exposed to someone with the coronavirus closely monitor for symptoms of COVID-19 and wear a mask whenever around other people. O’Malley said Pence and his wife, Karen, both tested negative on Saturday “and remain in good health.” After a day of campaigning in Florida on Saturday, Pence was seen wearing a mask as he returned to Washington aboard Air Force Two shortly after the news of Short’s diagnosis was made public.