Obama claims that he has read the Arizona Immigration Bill but White House Press Office won't answer questions

The Associated Press today reports:

Burton said Obama told McCain that he has read the Arizona law himself, and his concerns remain.

So I called up the White House Press Office and asked them:

"What in the bill precisely concerns the president? What passage or passages in the law concern him and he is basing his concerns on?"

No answer so far.

Also, note that today it has become clear that the 1,200 troops Obama is sending to the border are there for desk jobs.

President Obama is planning to deploy up to 1,200 National Guard troops to the U.S.-Mexico border, heeding calls from border state lawmakers that security needs to be improved.

An administration official confirmed to Fox News that Obama plans to deploy the National Guard troops as needed and request $500 million for "enhanced border protection and law enforcement."

The official said the National Guard would be used to "provide intelligence, surveillance and reconnaissance support," as well as support "counternarcotics enforcement" and provide "training capacity" until the Border Patrol can bring more officers on board. The additional funding would be used to improve border security technology and increase the number of agents, investigators and prosecutors targeting drug, human and weapons traffickers.

Sen. Jon Kyl, R-Ariz., said he's heard that "the 1,200 border patrol troops are, in effect, desk jobs." . . .