what do we know what happened on this phone call? >> reporter: we know it was another war of words between president donald trump and mexico's president enrique pena nie nieto. he will not visit the president for a previously scheduled march trip because president trump on the phone call continued to insist that mexico pay for his border wall. we know this is something that president donald trump has been talking about since his days on the campaign trail. and mexico has been very consistent. they won't be writing a check for that campaign wall. now, president donald trump -- excuse me border wall. president donald trump has been looking for money for that wall in a number of places, including capitol hill. and a bipartisan group of senators presented him with plan that would have provided $25 billion in border security in exchange for $1.2 million -- 1.2 million dreams to have citizenship. president trump rejected that deal and believes that mexico will pay for that wall. nieto is up for reflex in july