NEW : Obama bestowed nation 's highest civilian honor on Merkel . Obama warns of possible new sanctions against Germany . ` ` I trust her , '' Obama says of the visiting German ambassador . The two leaders emphasize personal rather than policy differences .
NEW : Obama bestows nation 's highest civilian honor on Merkel . Obama warns of possible new sanctions against Iran . `` I trust her , '' Obama says of the visiting German chancellor . The two leaders emphasize cooperation rather than policy differences .