UPDATE 1-Obama, Merkel discuss ongoing nuclear talks with Iran -White House

(Adds quote from statement) WASHINGTON, March 27 (Reuters) - President Barack Obamaspoke on Friday with German Chancellor Angela Merkel about theongoing nuclear negotiations with Iran, the White House said ina statement. "They reaffirmed their commitment to achieving a long termcomprehensive deal that fully and verifiably ensures that Iran'snuclear program is exclusively peaceful going forward, whilenoting that Iran must make the decisions necessary to resolveseveral remaining issues," the White