I suspect Senator Sessions will handle any awkwardness just fine. And a leadership aide points out: “we will only be on procedural motions this week, and won’t be on the bill or voting on amendments… he won’t miss any votes on the bill itself.”

UPDATE: Leadership aide emphasizes to anyone liable to give Sessions grief or suggest the White House is “blackmailing” him on immigration: “Reid can’t file cloture on proceeding to the new bill until Wednesday at the earliest, that means the earliest there will be a cloture vote is FRIDAY, the day AFTER his absence.”