Many Democrats have a hard time understanding why Republicans want to keep investigating the Sept. 11, 2012, terrorist attack in Benghazi, Libya.
Some see the GOP trying to score partisan points for this November's midterms. Others see a plot to undermine Hillary Clinton's 2016 prospects.
Republican sources on Capitol Hill say that, in general, the Pentagon's cooperation has been a model of how to deal with such an investigation, while the State Department and White House have been models of what not to do.
If the rest of the administration had followed the military's example, the Benghazi controversy would likely be over by now.
The probe started with three questions. One, was the U.S. adequately prepared for possible trouble abroad on the anniversary of Sept. 11? Two, did the government do everything it could to try to rescue the Americans who were under attack for seven and a half hours? And three, did the Obama administration tell the straight story about what happened?
Interviewing sources up and down the chain of command, Republicans went over all the military options that were activated or considered to aid the Americans under attack: two FAST platoons of Marines in Spain; a group called the Commander's In-Extremis Force, in Croatia; a special operations unit based in the U.S.; a fighter jet flyover; an armed drone; and more.
The GOP lawmakers came away satisfied that they saw everything; for example, when they asked whether AC-130 gunships could have been used, the Pentagon provided the location of every single AC-130 in the U.S. fleet at that time.
Another example was the possibility of a flyover. Even with other U.S. forces out of place, many lawmakers wondered whether American fighter jets could have buzzed the scene at Benghazi, possibly distracting and scattering the terrorists.
In the end, Republicans had few, if any, complaints about the military's cooperation. What a contrast to the rest of the Obama administration. First, there was the attempt to blame the attack on outrage over an anti-Muslim Internet video.
Then the State Department conducted an internal review that seemed designed, in part, to build a firewall around then-Secretary of State Hillary Clinton.
Then the administration failed to make available a single witness who was actually on the ground in Benghazi the night of the attack.
The administration's stance long ago exhausted whatever patience existed among Hill Republicans. Members are "really tired of getting jerked around," another aide said. That's a succinct explanation for the creation of the new select committee.
But it didn't have to be that way. The rest of the administration could have cooperated like the Defense Department. If it had, Washington would be talking about something else now. Instead, the fight goes on.
Byron York is chief political correspondent for The Washington Examiner.