NEWARK, N.J. (AP) — Republican Gov. Chris Christie Friday vetoed a closely watched bill involving pig cages — a piece of legislation seen by many as a gauge of his presidential ambitions.

The bill would have banned the use of pig gestation crates in New Jersey. Noting that the practice is not actually used in the state, Christie's veto message called the legislation a "solution in search of a problem." He also cited the views of New Jersey's Board of Agriculture and Department of Agriculture, which both termed the bill unnecessary.

Sarah Swingle of the Humane Society of the U.S., demonstrates in a human-sized "gestation crate," in front of the Statehouse, in Trenton Oct. 27. (AP Photo/Mel Evans)
Sarah Swingle of the Humane Society of the U.S., demonstrates in a human-sized "gestation crate," in front of the Statehouse, in Trenton Oct. 27. (AP Photo/Mel Evans)
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"I will rely on our in-state experts rather than the partisan politicians who sponsor this bill. These facts are no less true today," Christie said.

Gestation crates are metal cages so small pregnant pigs can't turn around. They're widespread in Iowa, a state that's home to millions of pigs — as well as the nation's first presidential nominating caucuses.

Christie, who is seriously considering a run in 2016, has invested significant time into building relationships in the state, including with GOP Gov. Terry Branstad, who has urged Christie to veto the legislation.

But animal rights advocates say the practice is cruel and want to stop it from spreading. To sway Christie, they launched a public relations blitz, complete with celebrity endorsements, and staged events where activists stand inside cages. They also commissioned polls to show support for the ban both in New Jersey and Iowa and say they flooded the governor's office with thousands of phone calls and emails.

Matt Dominguez, a public policy manager at the Humane Society earlier said: "If he [Christie] vetoes this bill, there really can be no other reason than his political aspirations."

Christie vetoed a similar bill last year.

Dave Warner, a spokesman for the National Pork Producers Council, which sent a lobbyist to the state to try to scuttle the bill, slammed the effort as a politically motivated plot to try to build momentum for a nationwide ban.

"We think hog farmers ought to have the right to choose which system works best for their animals," he said, adding that signing it could have negative political repercussions.

"I'm sure that there would be an awful lot of hog farmers who wouldn't appreciate it," he said.

Among them is John Ymker, 65, who runs a pork plant and attended a fundraiser Christie headlined for congressman Steve King in northwestern Iowa before the election this fall. The bill would hurt pork producers, he said.

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