Twenty-five days after that conversation, Johnson invited Kennedy to the Oval Office and told him face to face that he didn't want him as a running mate.
Johnson spoke to Kennedy forty-five days after that conversation. 
mnli hypothesis: Johnson spoke to Kennedy forty-five days after that conversation.  premise: Twenty-five days after that conversation, Johnson invited Kennedy to the Oval Office and told him face to face that he didn't want him as a running mate.