From the Senate Handbook, Article III.C.4.:
"Resolutions from any senator can be considered new business if: a) the
time available and the circumstances do not allow that the resolution
go through the normal process of consideration by a committee; b) the
resolution has been submitted in writing to the executive secretary
before it is put to a vote; and, c) the issue is pertinent to the
mission of the Senate. It shall be the responsibility of the chair to
rule on the application of these criteria."