If I didn't know better I would think Bonehead got something to hide.
Well... I think they all have something to hide. They all 'knew'. Our elected officials don't live in political vacuums. They all work together.
They knew, the WH knew, the Mexican Government knew, their Presidente knew.
The DEA and ATF were on opposite undercover cartel operations, and they participated in Shootout at the OK Corral, but the unlucky Border Patrol Agents got caught in the crossfire. The undercover guys couldn't 'blow' their cover, so they had to shoot. They were using weapons that they were forcing US Dealers to sell to 'mules' to supply them to the cartels.
The plan is not to 'close' the border, but to make it impassable but to the cartels, and those that can provide enough bribe money. The US 'officials' get a cut of the take. Nothing will cross the border without a bribe and the permission of both the cartels and our 'rulers'. The Administration has decided to use Arizona (rather than Texas, because Texans shoot people) as their 'control corridor', and you know the rest of the story.
Please, someone get him out of the cry room and tell him to DO HIS JOB!