Sen. Bob Corker

The president seems intent on keeping everyone on their toes, but it's not at all clear that there's a strategy behind it all.

The Senate Foreign Relations chairman is calling it quits and won't run for a third term. His retirement eliminates a thoughtful GOP voice who was also, at times, critical of President Trump.

On the committee level in the Senate, Republicans and Democrats have been able to get deals done. The problem will be what happens after bills leave the committees and head to the Senate floor.

If this Senate is getting some traction, it's not yet a threat to anyone's legislative hall of fame. Much higher hurdles loom, including highway funding, spending bills and the debt ceiling.