Mitt Romney's son, Tagg Romney, signed surrogacy agreement allowing for right to abort "abnormal fetus"

TMZ has the scoop:

TMZ has learned Mitt Romney's son Tagg -- who had twins this year through a surrogate -- signed an agreement that gave the surrogate, as well as Tagg and his wife, the right to abort the fetuses in non-life threatening situations ... and Mitt Romney covered some of the expenses connected with the arrangement."

From Paragraph 13 of the agreement:

"In the event the child is determined to be physiologically, genetically or chromosomally abnormal, the decision to abort or not to abort is to be made by the intended parents.  In such a case the surrogate agrees to abort, or not to abort, in accordance with the intended parents' decision."

And there's another relevant provision in Paragraph 13:

"Any decision to abort because of potential harm to the child, or to reduce the number of fetuses, is to be made by the intended parents."

Tagg Romney chose the same surrogate in 2009, and apparently that agreement did not have this clause.

Tagg Romney's lawyer says it was a careless mistake.