So the Senate is having a quorum call. I knew Nalder was lying about having to be home with his 'sick' wife. This is just a way to prolong the trial with him not there.
quorum call - A call of the roll to establish whether a quorum is present. If any senator "suggests the absence of a quorum," the presiding officer must direct the roll to be called. Often, a quorum call is terminated by unanimous consent before completion, which permits
the Senate to use the quorum call to obtain a brief delay to work out some difficulty or await a senator's arrival.