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President Barack Obama, standing with Vice President Joe Biden, delivers remarks in the East Room of the White House in Washington, Tuesday, July 14, 2015, after an Iran deal is reached.  Obama says every path to a nuclear weapon will be cut off from Iran under a historic agreement announced in Vienna. (AP Photo/Andrew Harnik, Pool)
President Barack Obama, standing with Vice President Joe Biden, delivers remarks in the East Room of the White House in Washington, Tuesday, July 14, 2015, after an Iran deal is reached.  Obama says every path to a nuclear weapon will be cut off from Iran under a historic agreement announced in Vienna. (AP Photo/Andrew Harnik, Pool)

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    Iran nuke deal puts Obama's legacy on the line

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Iran nuke deal puts Obama's legacy on the line

President Obama vows veto if Congress votes down Iran nuke deal, and tries to reassure allies wary of it. CNN's Jim Acosta reports.

Iran nuke deal puts Obama's legacy on the line

President Obama vows veto if Congress votes down Iran nuke deal, and tries to reassure allies wary of it. CNN's Jim Acosta reports.