WASHINGTON (AP) - A group of Senate Democrats have told the White House that they won't support passage of an Iran sanctions bill until at least the end of March.

WASHINGTON (AP) A group of Senate Democrats have told the White House that they won't support passage of an Iran sanctions bill until at least the end of March.

The decision could halt the march of legislation to levy more sanctions on Iran if no diplomatic agreement can be reached to prevent Tehran from being able to develop a nuclear weapon.

Diplomatic talks have been extended until July, with the goal of reaching a framework for a deal by the end of March.

Sen. Bob Menendez, D-N.J., who drafted the legislation with Sen. Mark Kirk, R-Ill., said Tuesday at a Senate banking committee hearing that he and many of his Democratic colleagues had sent a letter to President Barack Obama saying they won't support passage of the bill until after March 24.

Obama has threatened to veto any new sanctions legislation while American diplomats continue their push for an accord.