Sound recording of a meeting held on September 9, 1963, between President John F. Kennedy, Senator Mike Mansfield (Montana), and Senator Everett Dirksen (Illinois) to see what kind of support the White House could expect from these two men and others regarding the recently signed treaty banning atmospheric nuclear weapons tests (later known as the Partial Test Ban Treaty or Limited Test Ban Treaty). A letter is read to President Kennedy, and President Kennedy later issued this letter almost verbatim back to Senator Mansfield and Senator Dirksen. After the meeting ends, the recording continues with staff discussing Congress and other issues. Drilling can be heard in the background, and the recording is difficult to hear. The tape stops and starts at one point. It is difficult to ascertain much about these discussions. One segment of the recording totaling 3 minutes and 21 seconds has been removed in accordance with Section 3.4 (b) (1), (3) of Executive Order 13526. This sound recording has been excerpted from Tape 109, which contains additional sound recording(s) preceding and following this one. See Related Records to access Tape 109 in its entirety.