i look forward to great cooperation between our two countries, and with that, i'm happy to take a couple of questions. >> christina in. >> thank you. hi, mr. secretary. >> hi. >> can you explain what in this agreement was different between what was -- [inaudible] and has -- in addition, is there a separate agreement with the mexican government than what was announced friday that the president has suggested on twitter? both sides said if there's not enough progress, we're going to come back to table and evaluate that, what kind of metric are you going to use? is there a specific number or target you'd like to hit? >> sure. i was part of the conversations in december when the original protocols were put in place. the scale, the effort, the commitment here is very different from what we were able to achieve back in december. and, frankly, wouldn't have happened. the entire team from the mexican government that came up, they came up because the president had raised the specter of 5% tariffs on their products. it's what prompted this series of conversations that took on a level of seriousness, and a timed commitment th