From the Wall Street Journal:
While it is standard practice for such trips — known as CODELS, or congressional delegations—to be bipartisan, in this highly charged election year it is likely to raise eyebrows that the retiring Nebraskan senator — a prominent Iraq War critic—is the Republican expected to join the Democratic Party’s presidential nominee on what is sure to be a closely watched visit to the region.
Well, that would explain why they’re dumping the news on a Friday afternoon.